Patent ID: 8721740

Claim:
An agent for altering the color of keratin fibers comprising: (A) a color base composition containing, in a cosmetically acceptable medium: (a) from about 5% to less than about 50% by weight, based on the total weight of (A), of at least one fatty substance having a viscosity greater than about 50 mm 2 /s at 40° C.; (b) at least one rheology modifying polymer chosen from: (i) a slightly cross-linked, alkali-swellable acrylate polymer contained in an aqueous dispersion comprising about 30% by weight of total solids; and (ii) a cross-linked anionic acrylate polymer contained in an aqueous dispersion comprising about 32% by weight of total solids; and (c) at least one alkalizing agent; (d) at least one short alkyl chain hydroxy compound chosen from monoalcohols and polyols; (e) at least one oxidative dye precursor; and (B) an oxidizing composition comprising, in a cosmetically acceptable medium, at least one oxidizing agent; and wherein the pH of the agent for altering the color of keratin fibers ranges from about 1 to about 7.