Patent ID: 7758771

Claim:
A product comprising: at least one amphoteric agent chosen such that: the pH of the residue obtained is in the range from 5 to 10, the lowest of the acid pKs of the amphoteric agent is in the range from 5 to 10, and the highest of the basic pKs of the amphoteric agent is chosen in the range from 5 to 10, the highest of the basic pKs of the amphoteric agent is lower than the lowest of the acid pKs, at least one lipophilic absorbent, at least one hydrophilic absorbent, and at least one binary colored indicator chosen from the group consisting of the following mixtures: Nil blue/alizarin red, alizarin yellow/alizarin red, thymolphthalein/methyl red, phenolphthalein/methyl red and tropaeolin 00/thymol blue, and optionally at least one additive chosen from the group comprising fillers, granulating agents, and antistatic agents, and mixtures thereof.