To solve a problem in which, although substances which perform purification of air by negative ion effect are conventionally known and inks or binders including such substances as compositions exist, there is nothing capable of multifunctionally exhibiting sterilization effect or odor eliminating effect by clusterizing air.

The ink or binder enables the production of printed matter capable of exhibiting purification and various functions by printing which is a simple means. The ink or binder is produced by mixing a material that can clusterize moisture in air by irradiation with a weak radioactive ray and therefore can exhibit, as a cluster ion, functions of deodorizing a malodorous component and removing bacteria in air to thereby purify the air with a natural material having an insect-repellent property, a cosmetic property, a sanatory property or the like together in a microencapsulated form.