Patent ID: 8772184

Claim:
A reversible color-changing sanitizer-indicating nonwoven wipe, comprising: a nonwoven fabric; and a dried reversible color-changing ink formulation durably bound to the nonwoven fabric by drying using heat and/or vacuum; the reversible color-changing ink formulation including about 10-50% by weight of a polymer binder, about 10-50% by weight of a plasticizer, about 10-50% by weight of a wetting agent, and about 1-10% by weight of an anionic indicator compound, based on a dry weight of the ink formulation; wherein the reversible color-changing ink formulation causes the nonwoven wipe to repeatedly change back and forth between a first color when a free quaternary ammonium compound in the nonwoven wipe exceeds a threshold concentration and a second color when the free quaternary ammonium compound in the nonwoven wipe falls below the threshold concentration.