Water-immersion indicator indicia and articles bearing such indicia
AssigneePolaroid Corporation
InventorsMichael Filosa, Fariza Hasan, Stephen Telfer
Life of this patent
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Abstract
There are described articles bearing indicia applied with an ink composition which comprises two or more color-changing or color-forming components which combine, or become diluted, upon exposure to water for a sufficient period of time to cause a change in the appearance of the indicia. Also described are printing ink compositions for forming such indicia and methods for forming such articles.
Claims18
An indicia-bearing article, said indicia comprising an ink composition comprising two or more color-forming components which cause a change in the appearance of the indicia upon exposure to water for a sufficient period of time, wherein one of said color-forming components is an acid-sensitive leuco dye and the other of said components is an acid developer, and wherein said indicia are initially colored.
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A method for forming an indicia-bearing article comprising imprinting on an article indicia comprising an ink composition comprising two or more color-forming components which cause a change in the appearance of the indicia upon exposure to water for a sufficient period of time, wherein one of said color-forming components is an acid-sensitive leuco dye and the other of said components is an acid developer, and wherein said indicia are initially colored.
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Dependencies are inferred from the claim text.