Invisible ink and scratch pad

Details Invisible ink and scratch pad Invisible ink and scratch pad

2008-01-10

2011-11-08

Cain, Edward (Department: 1762)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

C523S161000

Reexamination Certificate

active

08053494

ABSTRACT:
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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