Improved invisible ink and scratch pad

Details Improved invisible ink and scratch pad Improved invisible ink and scratch pad

C - Chemistry, Metallurgy

09

D

C09D 11/00 (2006.01) B41M 5/124 (2006.01) B41M 5/132 (2006.01) B41M 5/155 (2006.01) C09D 5/26 (2006.01)

Patent

CA 2638581

An invisible ink, a method for preparing an invisible ink, and an invisible ink product are disclosed herein. An invisible ink comprising a first ink combined with a second ink is applied to a print medium. The first ink comprises a color developer activator without a color former leuco dye and the second ink comprises a color former leuco dye without a color developer activator. The first ink is prepared with a polyvinyl alcohol binder, dispersant/surfactant, and a wetting agent. The second ink is prepared with a polyvinyl alcohol binder, grind aid, dispersant/surfactant and defoamer. Heat generated by rubbing and/or scratching the invisible ink on the print medium activates the color former leuco dye and activator to change the color on the printing medium.

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