FIELD OF THE INVENTION

The present invention pertains generally to temporary tattoo decals that comprise

phptochromie material so that the decals pan be used as dosimeters and to methods for their use.

BACKGROUND Of THE INVENTION

Decals have been used for many decades for decorative effect on a variety of objects. Decals have also been used as temporary tatoos for application to skin. For example, ll.S, Pat No 4,522,864 issued to Humason leaches a decal having a porous paper hacking, a water-soluble slip layer on the surface of the paper backing, a microscopically thin, flexible, extensible water-resistant film covering the slip layer, a very thin translucent multi-color design offset (lithographically) printed on the water-resistant film, and a uniform layer of transparent or translucent pressure sensitive adhesive covering the design.

As another example US Pal. No. 6,074,7 1 to Moore teaches a temporary decal comprising a porous paper base coated with a water-soluble slip layer e.g , dextrin gum, on which offset printing inks are directly imprinted using a high speed lithographic process. The Inks are printed in a designated area only, in a desired image. A coating and a contact adhesive is then printed over the image area.

Decals have also been described which comprise photochromic materials so that they can be used as dosimeters. For example, US Patent 8,961 ,897 to Faran describes a dosimeter having a top layer comprising a photochromic ink composition in a polymer matrix, an opaque layer under the top layer and a bottom layer made of a sticky material for ataching to a user’s skin. U Patent 8,501,053 to Jeganathan describes a photoactive color changing ink, coating, plastic or printed article comprising a photochromic. dye. wherein in one embodiment the article is in the form of a temporary tatoo. US Patent 6,5 ⁾ 1 ,1 18 to Gonzalez describes a topical composition having a reversible visible change in color in response to a change in light comprising a photochromic material and a vehicle acceptable for topical application to the skin of a user, in one embodiment, the composition can be a tattoo product. US

2002/0022008 to Forest describes a sun protection kit and indicator comprising (a) a sunscreen and (b) an indicator comprising a photochromic molecule and a carrier, wherein the indicator comprises a solid film that is a temporary tattoo. i The above patents and patent application publications (which are hereby incorporated herein fay reference) do not consider that die components typically found in sunscreens, including titanium dioxide and zinc oxide, may be photoactive, particularly when present as nanopanicles. They have the ability to absorb IJV radiation, and in the presence of moisture convert water molecules into chemically active hydroxyl free radicals. These highly reactive chemicals are highly corrosive and, if sunscreen is used with a tattoo comprising a layer of photochromic material and comes in contact with a surface of a polymer matrix comprising the photochromic material _» the sunscreen could etch the surface of the photochromic layer resulting in the sunscreen becoming a permanent part of the matrix material. This could prevent II V radiation from co ing in contact with the photochromic material and thereby prevent a color change from occurring.

Accordingly, what is needed i* a tattoo decal for use with sunscreen that either has a

niatrix/photochromic layer that is capable of withstanding the corrosive effects of sunscreen or that has a layer of material that is resistant to sunscreen or that is capable of absorbing a minimal amount of sunscreen but that nevertheless protects a matrix/photocliromic layer of a tattoo decal from contact with the sunscreen so absorbed.

SUMMARY OF THE INVENTION

in a first embodiment of the inventi n, there is provided a temporary tattoo decal comprising: fa) a porous paper base;

(b) a water soluble sli layer or a release coating on at least a first surface of the paper base;

(c) a photochromic ink layer atop the slip layer or the release coating; and

(d) a pressure-sensitive adhesive layer atop the photochromic ink layer; wherein the photochromic ink layer comprises at least one photochromic material that is capable of changing Its color when exposed to U V radiation and a polymer matrix in which the at least one photoehrom material is distributed; and wherein the polymer matrix substantially prevents the. ink material from degrading when covered with a sunscreen product and inhibits the photochromic ink from washing off when the sunscreen product covering the photochromic ink layer is washed off; and wherein the temporary tattoo decal is constructed and arranged such that, when the porous paper base is wetted with water with the pressure-sensitive adhesive layer of the temporary tatoo decal pressed against the skin of a user, the porous paper base and slip layer or release coating can be separated from a remainder of the temporary tattoo decal leaving a photoehromic ink image adhered to the skin of the user via the pressure-sensitive adhesive layer. In a preferred embodiment, the polymer matrix comprises a polymer selected from the group consisting of shellac, polyurethane, acrylic polymer, silicone or a mixture thereof In a most preferred embodiment, the polymer matrix comprises shellac.

The temporary tattoo decal can further comprise a barrier layer between the photoehromic ink. layer and the pressure-sensitive adhesive layer that prevents the photoehromic material in the photoehromic ink layer from possibly migrating to the pressure-sensiti ve adhesive layer in a preferred embodiment, the barrier layer comprises shellac, acrylic, acrylate, polyurethane or cellulose.

The temporary tatoo decal can further comprise a removable release liner on the pressure- sensitive adhesive layer and a transparent sunscreen resistant layer between the sli layer or release coating and the photoehromic: ink layer. The transparent sunscreen resistant layer can preferably comprise a polymer selected from the group consisting of shellac, acrylic, acrylate, polyurethane, silicone and siloxaoe.

In a second embodiment of the invention, there is provided a temporary tattoo decal comprising:

(a) a porous paper base;

(b) a slip layer or release coaling on. at least a first surface of the paper base;

(c) a transparent clear coat layer atop the slip layer or release coating;

(d) a photoehromic ink layer atop the transparent clear coat layer, wherein the

photoehromic ink layer comprises (i) at least one photoChfomic material that is capable of changing its color when exposed to l)V radiation and (ii) a polymer matrix in which the at least one photoehromic material is distributed; and

(e) a pressure-sensitive adhesive layer covering _: the photoehromic ink layer, wherein the temporary tattoo decal is constructed and arranged such that, when the porous paper base is wetted with water with the temporary tattoo decal disposed with th pressure- sensitive adhesive layer pressed against the skin of a user, the porous paper base and slip layer or release coating can be separated from a rem ainder of the temporary tattoo deca l leaving a photoehromic· ink image adhered to the skin of the user via the pressure-sensitive adhesive layer; and wherein the transparent clear coat layer comprises a material that is constructed and arranged to al low at least a portion of a sunscreen prod uct, w hen deposited on a top surface of the clear coat layer, to adhere just well enough to a surface of the clear coat layer to filter UV light from the photoehromic layer below, the clear coat layer being transparent to allow 11 V radiation to pass through the clear coat layer to the photoehromic ink layer at least when the surface of t he clear coat layer is not covered with the sunscreen product, in a preferred embodiment, the polymer matrix comprises a polymer selected from file group consisting of shellac, polyurethane, acrylic polymer and a mixture thereof.

The temporary tattoo decal according to the second embodiment can further comprise a barrier layer between the photoehromic ink layer and the pressure-sensitive adhesive layer that prevents the photochroraie material in the photoehromic ink layer from possibly

migrating to the pressure-sensitive adhesi e layer. The barrier layer can comprise, for example, shellac, acrylic, acrylate, polyurethane or cellulose.

The temporary tattoo decal according to the second embodiment can further comprise a removable release liner on the pressure-sensitive adhesive layer. The removable release liner can comprise, for example, a silicone-coated polyester film.

Hie temporary tattoo decal according to the second embodiment can comprise a clear coat layer comprising a polymer selected from the group consisting of shellac, acrylic, acrylate, pdiyorethane, silicone and slloxane.

In accordance with a third embodiment of the invention, there is provided a temporary tattoo decal comprising. ^*

(a) a carrier film with pressure-sensitive adhesive coating on a first surface thereof;

(b) a photoehromic ink layer on a surface of the carrier film that is opposed to the first surface comprising the pressure-sensitive adhesive coating; wherein the photoehromic· ink layer compr ises at least o ne photoehromic material that is capable of changing its color when expose to UV radiation and a polymer matrix in which the at least one photoeliromic material is distributed; and wherein the polymer matrix substantially prevents the ink material from degrading when covered with a sunscreen product and inhibits the photoehromic ink from washing off w hen the sunscreen product co vering the photoehromic ink layer is washed off. The temporary tatoo decal according to the third embo iment can preferably comprise a release liner removably attached to the pressure sensitive adhesive coating to protect tile pressure sensitive adhesive coating. The release liner can preferably comprise a silicone- coated polyester film or paper.

The temporary tattoo decaf according to the third embodiment can comprise a transparent clear coat layer atop the photochromic Ink layer to prevent sunscreen applied to the

temporary tatoo decal from penetrating to the photochromic ink layer. The clear coat layer preferably comprises a polymer selecte from the group consisting of shellac, acrylic, acrylate, polyurethane, silicone and siloxane.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. I is a depiction of tattoo constructions 1 A~C, 2 A~C and 3A-C representing different possible arrangements of the layers in preferred tatoo constructio types of the i nvention; and

Fig. 2 is a depiction showing preferred materials and thicknesses of the layers in preferred tattoo cotstrdctibn types

DETAILED DESCRIPTION

The temporary tatoo decals of the invention can be iv uled into two (2) basic construction types depending on how the decals are attachable to the skin of a user.

First Construction Type

In a first construction type, the decals use a porous paper base comprising (usually, just one side) a release coating, such as non-stick silicone, which facilitates separation of the paper base from a photochromic ink layer printed thereon. A transfer film comprising, for example, gelatin or other polymeric materials can be printed or otherwise formed on the non-stick silicone. Alternatively, the paper base can be coated with a water-soluble slip layer, whic may be, for example, dextrin gum, which dissolves when die paper base is saturated with water to effect separation of the paper base from the photochromic ink layer. The

combination of the porous paper base with non-stick release layer or with a slip layer is available as standard prefabricated decal paper from a variety of sources, A preferre tattoo paper is commercially available from One Stop Papers, LLC under the trademark

TRANSUDE®“T” ECO temporary Tatoo Transfer Paper. A photochromic ink layer printed on the prefabricated decal paper can be separated therefrom by weting the prefabricated decal paper with water. Preferred embodiments of this first construction type are described next with reference to tattoo constructions 1A, IB, 2A and 2B in Fig, 1 attached.

In each of these embodiments, the left side diagram shows the layers sequenced in order of their preparation wherein the right side diagram shows the layers sequenced in the

configuration in which they are applied to the skin of a u ser.

The embodiment of construction 1 A depicts: a basic form of the first type of construction wherein photochromic ink is printed directly atop the decal paper with pressure sensitive adhesive being coated atop the photochromic ink. A releasable cover sheet or liner comprising, for example, a polyester such as Mylar can be layered atop the pressure-sensitive adhesive to protect it until the tattoo decal b ready for application whereupon it can be taken off, as shown on the right side diagram. The pressure-sensitive adhesive can be an acrylic or any other pressure sensitive adhesive. The photochromic ink can comprise a photochromic pigment or dye in a polymer matrix, such as shellac or polyurethane as discussed further below.

The embodiment of construction 1 S is the same as that of construction 1 A, except a barrier layer is added between the photochromic ink layer and the pressure-sensitive adhesive layer (left side diagram). This ad itional layer prevents the photochromic ink from penetrating into and through the pressure-sensitive adhesi ve layer and onto the skin of a user (right side diagram). The barrier layer may be made, for example, of shellac, acrylic or another barrier material.

The embodiment of construction 2 A is the same as that of construction 1 A, except a

transparent clear coal layer is added between the photochromic Ink layer and the decal paper layer (left side diagram). The clear coat layer is adapted to protect the photochromic ink layer from degradation from sunscreen that may be applied atop the tattoo after it is applied to the skin of a user (right side diagram).

The embodiment of construction 2B is the same as that of construction 2A, except a transparent clear coat layer is added between the photochromic layer and t e decal paper layer (left: side diagram). The clear coat layer is adapted to protect the photochromic ink layer from degradation from sunscreen that may be applied atop the tattoo after it is applied to the skin of a user (right si de diagram). To apply a temporary tattoo decal of this type of construction to the skin of a user, the clear Mylar cover sheet would be removed and the contact adhesi ve side of the decal would be placed on the skin. The tattoo release paper comprising the porous paper base would then be pressed against the skin and wetted or saturated with water to facilitate removal of the release paper or dissolution of the slip layer and to cause transfer of a photoehromic image to the skin. A preferred method of applyin g the tattoo to the skin of a user comprises the following steps:

1 , preferably the sk in would be completely cl ean of oils and makeup;

2 any Mylar or other cover sheet would be removed tram the tattoo decal and

discarded;

3, the tattoo decal would be placed face down on the clean and, preferably, very dry skin;

4, the. back: of the tattoo decal would be wette with a very wet cloth or water, and firm pressure would be applied to the back of the tattoo decal;

5 after a waiting period, preferably lasting about 30 seconds, the paper backing would be lid off; and

6, optionally, the tattoo would be washed gentl with soap and water for a more realistic look.

In the second construction type, the photoehromic ink is printe either (a) on a thin carrier film supplied with pressure sensiti e adhesive and, optionally, removable liner (medical grade) in a single, aiMn~one product, or tb) on a protective clear film that, optionally, has a pressure sensitive adhesive and liner Pre- anufactured products of the thin carrie fil are available, for example, from the Minnesota Mining and Manufacturing Company (3M) of Maplewood, Minnesota, With this construction type, the photoehromic ink layer is printe or otherwise applied directly onto the carrier film with adhesive or onto the protective clear film layer. This construction is like a very thin sticker in that the tattoo decal is peeled from a release liner and affixed to the skin of a user. There is no need to apply water to remove the release liner, A lightweight slightly tacky, removable film ma be applied to the top coating layer for ease of tattoo positioning on the skin of a user. Preferred embodiments of this type of construction are described next with reference to Fig. 1,

? The embodiment of construction C depicts a basic form of thi s type of eonstmction wherein photoehromic ink is printed directly onto the carrier film (left side diagram). The release liner can be peeled from the carrier film and the decal is pressed against the skin of the user with the layers in the same sequence (see right side diagram).

The embodiment of eonstmction 2C is the same as that of eonstmction 1C, except that a transparent clear coat layer is coated or otherwise deposited atop the photoehromic ink layer (left side diagram). The clear coat layer is adapted to protect the photoehromic ink layer from degradation from sunscreen that may be applie atop the tattoo after It i s applied to the skin of a user (right side di agram).

In the embodiments of construction 3A, 3B an 3C, photoehromic ink is applied atop a protective clear film layer with optional carrier film (left side diagrams). The protective clear film layer protects the photoehromic ink layer from, e.g., degradation due to sunscreen and can be have the same composition as the clear coat layer described above.

For options 3 A and 3J¾ the photoehromic ink may preferably be printed onto the protective clear film layer. For option 3C, the protective clear film layer ma preferabl be laminated to a surface of the photoehromic ink by beat-activated or pressure-sensitive adhesive, hi embodiment 3A, a pressure-sensitive adhesive layer is applied atop the photoehromic ink followed by a release liner (left side diagram). In application, the release finer is peeled away and the pressure-sensiti ve adhesi ve layer is pressed against the skin of a user with the protective dear film layer ato an protecting the photoehromic ink (right side diagram).

The embodiment of construction 3 B is the same as that of constructi on 3 A, except a barrier layer is added between the photoehromic ink layer and the pressure-sensitive adhesive layer (left side diagram). This additional layer prevents the photoehromic ink from penetrating into and through the pressure-sensitive adhesive layer and onto the skin of a User (right side diagram). The barrier layer may be made, for example, of shellac, acrylic or another barrier material.

Embodiment 3C differs from embodiment 3 A in that it is provided with an all-in-one carrier film layer, including pressure sensitive adhesive and removable liner top the photoehromic ink layer, instead of the pressure-sensitive adhesive layer and release liner as in embodiment 3A (left side diagram). In application, the removable liner is removed fro the carrier film layer and the carrier film layer with pressure- sensitive adhesive is pressed against the skin of a user with the protecti ve clear film layer atop the photoehromio ink layer (right side diagram).

The photoehromie inks for use in the photochroraic ink layers of the above construction types comprise (i) at least one photoehromie material that is capable of changing its color when exposed to UV radiation; (is) a polymer matrix in which the at least one photoehromie material is distributed; and optionally (iii) a component or components that change a rate at which the at least one photoehromie material changes its color hen exposed to UV radiation or inhibits the at least one photoehromie material from reverting to its original color. The matrix is preferably one that (a) substantially prevents the ink composition from degrading when covered with the sunscreen produet and (b) inhibits the ink composition from washing off when the sunscreen is washed off. The matrix is preferably selected from the groupconsisting of shellac, polyurethane, acrylic polymer, silicone or a mixture thereof. The matrix most preferably comprises shellac.

The photoehromie material can be either a photoehromie pigment or a photoehromie dye. In accordance with one preferred embodiment of the invention, the photoehromie pigment or dye is selected such that the color change is reversible. In accordance with this embodiment, the at least one reversible photoehromie pigment or dye that is either (a) colorless in an inactive state, activates to color when exposed to ultraviolet (UV) light, reverts to colorless when covered with the selected sunscreen product and re activates to color when the sunscreen product is removed, or (b) an initial color in. an inactive state, activates to colorless or to a different color when exposed to ultraviolet (UV) light, reverts to the initial color when covered with the selected sunscreen product and re-activates to colorless or to the different color when the sunscreen product is removed. In a preferred embodiment, the at least one pigment or dye can comprise a naphihoxaxine-based photoehromie dye that yields green ink when dried, but turns to a brilliant blue in the presence of sunlight.

In another preferred embodiment, the photoehromie pigment or dye and the other

components of the Ink composition may he selected such that the color change of the at least one pigment or dye is irreversibl in that the color of the photoehromie pigment or dye would not reverse after it has been exposed to a predetermined amount of UV radiation. In this embodiment, an initial color of the photoehromie pigment or dye can fade from a bright. activated color to a faded color after it has been exposed to a predetermined amount of UV radiation.

The photochromic material can comprise any of the phoiochromie pigments or dyes described in Applicant’s PCT application, PCT/US 17/477 1, filed 1 August 2017 For example, the photochromic: material can comprise a pigment or dye selected from the group consisting of oxaziues, naphtoxaxines, spiro-naphthoxazines, pyram, spifo yrans,

pthopyram, spironapthopyrans, folgides, diarylethenes having heterocyclic aryl groups, dihydrtundo!izhies, qa ones, periratdinesptfoeycfoheadfcTtones, viologens and mixture thereof

The photochromic material and other components can he i ncorporated within the matrix by means of any known-in-ihe-art suitable: method, for example by extruding, molding, casting or printing. Although the aforementioned matrixes are preferred in all of the construction types because they protect die photochromic layer from degradation by sunscreen applied onto the temporary tattoo decals, other matrixes can be advantageously used in the construction types that comprise a transparent clear coat layer that protects the photochromic layer from sunscreen, as in constructions 2 A, 2B and 20 depicted above. The transparent clear coat layer can preferably comprise shellac, acrylic/acrylate, polyurethane, silicone,siloxane or low density polyethylene.

EXAMPLE I

Preferred Materials

Preferred layers for each of the construction types along with a description of the preferredand most preferred thickness of each of the layers are shown in Fig 2,

EXAMPLE 2

Test of effects of sunscreen exposure on tattoo made with shellac-based photochromic i nks without

Materials:

One yellow tattoo sample was prepared at Sionebridge Coating Laboratories, Inc. of

Plymouth, Michigan by drawing down a yellow photochromic ink onto tattoo release paper from The Tattoo Factory. Drawdowns wore allowed to dry overnight then an adhesive layer was applied using adhesive sheets in Printable Tattoo Kit made by Silhouette. The sample was cut and identified as 363 A - Yellow Triangle Tatoo made with dads’ 2% Photochromic Shellac Ink Sunscreens used in the study Included Coppertone Waterbabies Lotion SPF 50 and

Coppertone Sport Lotion SPF SO.

The tattoo was applied to a thin rubber sheet (synthetic skin for tattoo practice) following manufacturer's recommendations. The dear sheet was removed and tattoo placed upside down onto the rubber sheet A water saturated paper towel was put over the tattoo paper backside, covered with a 4” x 4” piece of glass and a 1 Kg weight. After 30-35 seconds, the paper was peeled away . The tattoo fully transferred and appeared smooth.

The tatoo was divided into three sections by lines drawn on them with Sharpie marker creating an area to serve as control with no sunscreen and then two other areas where the two sunscreens were applied.

Sunscreens were applied and spread uniformly throughout each section using a gloved finger making circular motions, followed by linear up and down, then side- to-side motions. Gloved lingers were change to prevent cross-contamination between sunscreens, The sample was immediately photo-acti vated using an artificial son lamp, observed for color change, photographed and allowed to set unactivated for one hour. Sample was then washed with hand soap and water, blotted dry, re-activated and photographed.

The tattoo was evaluated for color observations. The yellow ink photo-activated from its colorless appearance to a deep gold/yellow color in the presence of the U V light. The color faded pretty well with the application of sunscreen, but di not turn completely colorless. Upon washing, all color returned on the yellow tattoo.

EXAMPLE 3

Sunscreen resistance test with temporary tattoos with a shellac-based photochromic ink

MuKriuk:

One yellow shellac-based ink was tested comprised of shel lac, denatured alcohol, photochromic dye predissolved in solvent.

Two sunscreen lotions were used in the study including Coppertone Water Babies Pure & Simple SPF 50 and Coppertone Sport SPF 50. Sample Preparation :

The ink was drawn down on tattoo release paper «sing 0,0015*’ bird blade applicator. Films were allowed to dry overnight then: bonded with a layer of tattoo adhesive applied via squeegee creating a sheet of temporary tattoo material having the following construction'

Small rectangles were cut from the larger sheets creating the tattoos. They were affixed to the synthetic·• _' in rubber sheets by removing the clear mylar sheet, positioning the onto the substrate, applying a water saturated paper towel folded in 4 with a 4” x 4” x ¼” glass plate and 1 kg weight atop for 30 seconds. The tattoo release paper w s then removed and: the transferred tattoo blotted dry. The resulting tattoo samples were as follows:

Three temporary' tattoos were affixed to the rubber sheet, top to serve as a control with no sunscreen, middle to be treated with Water babies and bottom sample with Sport 50,

Sunscreens were applied and spread qniformly throughout each square using a gloved finger making circular motions, followed by linear up and down, then side-to-skle motions. Gloved singers were changed to prevent cross-contamination between sunscreens.

The sunscreens were allowed to remain on the tattoos for 2 hours prior to washing with hand soap, water and clean terry towel. They were photographed before activation, after

activation, after sunscreen application and after wash.

Tattoos transferred well to the rubber sheets resulting in glossy, colorless rectangles. Upon activation with an indoor sunlamp, the tattoos changed from colorless to yellow/gold. The color faded for the most part when sunscreen wa applied. Alter 2 hours, the sunscreens were washed off with soap, water and terry towel then reactivated with the sunlamp. All of the tattoos returned to their original color and appeared to be intact on the rubber sheets.

EXAMPLE 4

Sanscreen resistance test with temporary tattoos comprised of urethane eleareoats atop a¾o|pchromjc _. mk§.

MaMmk:

Five different urethane-based eleareoats, both glossy and matte finish, were tested atop three different color aeryife/vinyl photochromse inks; blue, violet and yellow.

Two sunscreen lotions were used in the study including Coppertone Water Babies Pure &Simple SPF 50 and Coppertone Sport SPF 50, and one spray sunscreen was used, Coppertone Kids SPF Broad Spectrum 50,

Sample Preparation;

The eleareoats were drawn down on tattoo release paper using 0.0015” bird blade applicator. Films were allowed to dry for one week then photo hromic inks were applie depositing the same 0.0015” of wet. ink onto the dried eleareoat films. Samples were allowed to dry overnight then bonded with a layer of tatoo adhesive applied via squeegee creating a sheet of temporary tattoo material having the following construction:

Small rectangles wer cut from the larger sheets creating the tatoos. They were affixed to the synthetic skin rubber sheets by removing the clear mylar sheet, positioning them onto the substrate, applying a water saturated paper towel folded in 4 with a 4” x 4” x ½’ ^r glass plate and I kg weight atop for 30 seconds. The tatoo release paper was then emoved and the transferred tattoo blotted dry. The resulting tattoo samples were as follows;

Four sets of fifteen temporary tattoos were affixed to rubber sheets, top ro w to serve as acontrol with 3 sunscreen, middle to be treated with Water babies and bottom sample with Sport SO arid a separate sheet to be sprayed with Coppertone Kids spray sunscreen.

Sunscreens were appl ied and spread uniformly throughout each square using a glove finger making circular motions, followed by linear up and down, then side-to side motions. Gloved fingers were changed to prevent cross-contamination between sunscreens.

The sunscreens were allowed to remain on the tattoos tor hours prior to washing with hand soap, water and clean terry towel. They were photographed before activation, after

activation, after sunscreen application and after wash.

RewMA CmclmMii

Tattoos transferred well to the rubber sheets resulting in colorless rectangles. Upon activation with an indoor sunlamp, the tattoos changed from colorless to their respecti ve colors; blue, violet and yellow. The color faded somewhat when sunscreen was applied. Alter 2 hours, the sunscreens were washed off with soap, water and terry towel then reactivated with the sunlamp. All of the tattoos returned to mostly io their original color and appeared to be intact on the rubber sheets, including those with the spray sunscreen.

EXAMPLE 5

Sunscreen resistance test with temporary tattoos comprised of acrylic-urethane eareoat atop shellac-based nhotoehromie Inks.

One acr he-urethane-based elearcoat was tested atop two shellac-based phoiochromte inks, one yellow and One blue.

Two sunscreen lotions were used in the study including Coppertone Water Babies Pure & Simple SPF 50 and Coppertone Sport SPF 50, and one spray sunscreen was used, Copperton Kids SPF Broad Spectrum 50, Sample Preparation:

The ciearcoat was drawn down on tattoo release paper using 0,0015” bird blade applicator. Films were allowed to dry for one week then photochromic inks were applied depositing the same: 0.0015 of wet ink onto the dried ciearcoat films. Samples were allowed to dry overnight then bonded with a layer of tattoo adhesive applie via squeegee creating a sheet of temporary tatoo material having the following construction:

Small rectangles were cut from the larger sheets creating the tattoos. They were affixed to the synthetic skin rubber sheets by removing the clear mylar sheet, positioning them onto the substrate, applying a water saturated paper towel folded in 4 with a 4” x 4” x Vf ^* glass plate and 1 kg weight atop for 30 seconds. The tatoo release paper was then removed and the transferred tattoo blotted dry. The resulting tattoo samples were as follows:

Four sets of two temporary tattoos were affixed to rubber sheet, top row to serve as a control with no sunscreen, middle to be treated with Water babies and bottom sample with Sport 50 and a separate sheet to be sprayed with Coppertone Kids spray sunscreen.

Sunscreens were applied and spread uniformly throughout each square using a gloved finger making circular motions, followed by linear up and down, then side-to-s!de motions. Gloved lingers were change to prevent cross-contamination between sunscreens.

The sunscreens were allowed to remain on the tattoos for 2 hours prior to washing with hand soap, water and clean terry towel. They were photographed before activation, after

activation, after sunscreen application and after wash. is Remits Conclusions:

Tattoos transferred well to the robber sheets resulting in glossy, colorless rectangles. Upon activation with an indoor sunlamp, the tattoos changed from colorless to their respective colors; blue and yellow. The colors faded to colorless when sunscreen was applied. After 2 hours, the sunscreens were washed oft ^' with soap, water and terry towel then reactivated with the sunlamp. All of the tattoos returned to most of their original color and appeared to be intact on the rubber sheets, including those with the spray sunscreen.

Although certain preferred embodiments of the invention: have been described herein, it will be apparent to those skilled in the art that variations and modifications may he made without departing from the spirit and scope of the invention as defined by the following claims.