Method and apparatus for indicating ultraviolet light exposure

Details Method and apparatus for indicating ultraviolet light exposure Method and apparatus for indicating ultraviolet light exposure

1998-12-03

2000-04-25

McPherson, John A.

Radiation imagery chemistry: process, composition, or product th

Dye image from radiation sensitive dye or dye former by dry...

Composition or product

430338, 430332, 2504731, 2504741, G01J 150

Patent

active

06054256&

ABSTRACT:
Applications of photoerasable colorant composition include photoerasable price markings for pricing goods, documents such as gaming tickets for securely communicating concealed information, photoerasable paint for temporary markings on terrain and structures such as signs, roadways, trees, and buildings, marking instruments such as pens, and wick or felt markers, ultraviolet light exposure indicators, and dry printing. The photoerasable or mutable colorant composition comprises a mutable colorant and an ultraviolet radiation transorber which, upon irradiation with ultraviolet radiation, interacts with the colorant to irreversibly mutate the colorant and thereby render the colorant substantially colorless. The mutable colorant composition may also include a molecular includant.

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