received by the International Bureau on 09 November 2020 (09.11.2020)

[Claim 1] A method for detecting ultraviolet (UV) radiation, comprising:

applying a UV indicator ink on human skin, the applying resulting in a first impression on human skin, wherein exposure of the first im pression to UV radiation changes a color of the first impression to a first color; and

applying a standard colored ink on human skin, the applying resulting in a second impression on human skin located proximate to the first im pression, the second impression having a second color.

[Claim 2] The method of claim 1, wherein the second color substantially matches the first color.

[Claim 3] The method of claim 1 or 2, wherein the UV indicator ink and the standard colored ink are concurrently applied to the human skin.

[Claim 4] The method of claim 1, 2 or 3, further comprising covering the first im pression by applying a sunscreen material, the covering changing the first impression from the first color to colorless.

[Claim 5] The method of claim 4, further comprising determining a location of the first impression that is colorless by locating the second impression. [Claim 6] The method of claim 4 or 5, further comprising re-applying the

sunscreen material based on saturation level of the first color.

[Claim 7] The method of claim 6 wherein re-applying comprises:

comparing the first color of the first impression with the second color of the second impression to determine a saturation level of the first color; and

re-applying the sunscreen material based on a determination of the saturation level of the first color.

[Claim 8] The method of any one of claims 1 to 7, further comprising:

determining a color intensity of the second color of the second im pression; and

re-applying the UV indicator ink and the standard colored ink if the color intensity of the second color is less than a color intensity of a prescribed second color.

[Claim 9] The method of any one of claims 1 to 8, wherein the changing of the color of the first impression is independent of temperature.

[Claim 10] A method for detecting ultraviolet (UV) radiation, the method

comprising:

applying a UV indicator mixture on human skin, the applying resulting in an impression on human skin, the UV indicator mixture comprising:

(a) a UV indicator ink and a standard colored ink or (b) one or more photochromic pigments and/or dyes in a standard colored ink; and exposing the impression to UV radiation, the exposing changing a color of the impression from a first color to a second color.

[Claim 11] The method of claim 10, wherein the UV indicator ink or the one or more photochromic pigments and/or dyes is colourless in the absence of UV radiation and in the presence of visible light.

[Claim 12] The method of claim 10 or 11, wherein the changing of the color of the impression is independent of temperature.

[Claim 13] The method of claim 10, 11 or 12, further comprising covering the im pression by applying a sunscreen material.

[Claim 14] The method of claim 13, further comprising re-applying the sunscreen material based on a saturation level of the second color.

[Claim 15] The method of any one of claims 10 to 14, wherein the first color is white.

[Claim 16] The method of any one of claims 10 to 15, further comprising re

applying the UV indicator mixture based on determining if the first color or the second color is wearing off.

[Claim 17] An applicator device, comprising:

a container having a first chamber and a second chamber, the first chamber comprising a UV indicator ink and the second chamber comprising a standard colored ink;

a cap removably coupleable to the container; and an applicator assembly coupled to the container, the applicator assembly comprising:

a first ink pad fluidly coupled to the first chamber to impregnate the first ink pad with the UV indicator ink; and

a second ink pad fluidly coupled to the second chamber to impregnate the second ink pad with the standard colored ink.

[Claim 18] The applicator device of claim 17, wherein the applicator assembly comprises a housing having a first cavity and a second cavity, the first cavity sized and shaped to coupleably receive the first ink pad, and the second cavity sized and shaped to coupleably receive the standard colored ink pad.

[Claim 19] The applicator device of claim 17, wherein the container comprises a partition wall that is sized and shaped to fluidly isolate the first chamber from the second chamber. [Claim 20] The applicator device of claim 18, wherein the container comprises a partition wall that is sized and shaped to fluidly isolate the first chamber from the second chamber, and the housing comprises a recess that is sized and shaped to coupleably receive the partition wall.

[Claim 21] The applicator device of any one of claims 17 to 20, further

comprising:

a sunscreen container having a primary chamber, the primary chamber sized and shaped to hold a sunscreen material.

[Claim 22] The applicator device of claim 21, wherein the sunscreen container is hingedly coupled to the container, the container rotatably moveable relative to the sunscreen container in a first rotary direction.

[Claim 23] The applicator device of claim 22, wherein the cap is hingedly coupled to the container, the cap rotatably moveable relative to the container in a second rotary direction, the second rotary direction being opposite of the first rotary direction.

[Claim 24] The applicator device of any one of claims 17 to 23, wherein the

standard colored ink comprises one or more white pigments.

[Claim 25] An applicator device, comprising:

a container having a chamber, the chamber containing a UV indicator mixture, the UV indicator mixture comprising: (a) a UV indicator ink and a standard colored ink or (b) one or more photochromic pigments and/or dyes in a standard colored ink;

a cap removably coupleable to the container; and an applicator assembly coupled to the container, the applicator assembly comprising an ink pad fluidly coupled to the chamber to im pregnate the ink pad with the UV indicator mixture.

[Claim 26] The applicator device of claim 25, wherein the applicator assembly comprises a housing having a cavity, the cavity sized and shaped to coupleably receive the ink pad.

[Claim 27] The applicator device of claim 25 or 26, further comprising a sunscreen container having a primary chamber, the primary chamber sized and shaped to hold a sunscreen material.

[Claim 28] The applicator device of claim 27, wherein the sunscreen container is hingedly coupled to the container, the container rotatably moveable to the sunscreen container in a first rotary direction.

[Claim 29] The applicator device of claim 28, wherein the cap is hingedly coupled to the container, the cap rotatably moveable relative to the container in a second rotary direction, the second rotatory direction being opposite 31 of the first rotary direction.

[Claim 30] The applicator device of any one of claims 25 to 29, wherein the

standard colored ink comprises one or more white pigments.

[Claim 31] An applicator assembly coupleable to a container, the applicator

assembly comprising:

a first chamber sized and shaped to contain a UV indicator ink;

a second chamber sized and shaped to contain a standard colored ink; a first ink pad fluidly coupled to the first chamber to impregnate the first ink pad with the UV indicator ink;

a second ink pad fluidly coupled to the second chamber to impregnate the second ink pad with the standard colored ink; and

a partition wall that is sized and shaped to fluidly isolate the first chamber from the second chamber.

[Claim 32] The applicator assembly of claim 31, further comprising:

a housing having a recess that is sized and shaped to coupleably receive the partition wall, and wherein the first chamber and the second chamber are positioned in the housing.