Reversible color-changing ink formulations and nonwoven wipes

A reversible color-changing sanitizer-indicating nonwoven wipe, comprising:

• a nonwoven fabric including about 55-90% by weight absorbent nonwoven fibers and about 10-45% by weight reinforcing nonabsorbent nonwoven fibers;
• and
• a dried reversible color-changing ink formulation coated onto and durably bound to the nonwoven fabric using a polymer binder selected from the group consisting of polyamides, polyurethanes, and combinations thereof;
• the durably bound reversible color-changing ink formulation comprising, based on a dry weight of the ink formulation, about 65-96% by weight of the polymer binder, about 0.3-10% by weight of a reversible color-changing dye including a bromine compound, and about 0.5-20% by weight of at least one of a particulate inorganic filler and a color brightener;
• wherein the durably bound reversible color-changing ink formulation enables the nonwoven wipe to repeatedly change back and forth between a first color and a second color at a pH between about 5.5 and about 8.0 during repeated cycles of use of the nonwoven wipe with a quaternary ammonium sanitizer solution, without separating the ink formulation from the nonwoven fabric.