| abstract |
(57) [Summary]nApplications of the photo-erasable colorant composition include photo-erasable price marking for pricing products, documents such as gambling tickets for safe transmission of hidden information, signs, roads, trees and buildings, etc. Temporary markings on the environment and buildings, marking tools such as pens and wicks or felt pens, UV exposure indicators, and dry printing. The photoerasable or variable colorant composition interacts with the variable colorant and the colorant when irradiated with ultraviolet light, causing the colorant to irreversibly change, thereby rendering the colorant substantially colorless. Contains UV transmitting material. The variable composition can also include a molecular inclusion. |