Patent ID: 8772186

Claim:
A reversible color-changing sanitizer-indicating nonwoven wipe, comprising: a nonwoven fabric; a dried reversible color-changing ink formulation durably bound to the nonwoven fabric using a polymer binder and by drying using heat and/or vacuum; and a sanitizer composition impregnated in the nonwoven wipe which includes a free quaternary ammonium compound; wherein the reversible color-changing ink formulation comprises at least the polymer binder, an anionic indicator and an ionic stabilizer, and causes the nonwoven wipe to repeatedly change back and forth between a first color when the 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; and the reversible color-changing ink formulation is durably bound to the nonwoven fabric by drying before the sanitizer composition is impregnated in the nonwoven wipe.