Color changing compositions for highlighters

An overcolor coloring composition comprising (a) from about 0.1% to about 12% by weight of a base;

• (b) from about 1% to about 20% by weight of a reducing agent;
• (c) from about 0.05% to about 15% by weight of an overcolor dye which maintains its characteristic color in the presence of said reducing agent and said base;
• and from about 0.5% to about 20% by weight of a surfactant.

An undercolor coloring composition comprising (a) an effective amount of an acid sufficient to maintain the pH of said undercolor coloring composition at from about 3 to about 6;

• (b) from about 0.05% to about 1% by weight of an undercolor dye;
• and (c) from about 20% to about 60% by weight of a surfactant.

A multiple coloring composition system comprising:

• (a) an aqueous undercolor coloring composition comprising an undercolor dye whose coloring ability is destroyed in the presence in the presence of a pH of about 10 or greater and/or a reducing agent, and a compatible surfactant in an amount sufficient to increase the stability of said coloring composition;
• and
• (b) an aqueous overcolor coloring composition comprising an overcolor dye capable of maintaining its characteristic color in the presence of a reducing agent, an effective amount of a reducing agent sufficient to destroy the coloring ability of said undercolor dye, and a compatible surfactant in an amount sufficient to increase the capillary flow of said aqueous overcolor coloring composition.