Patent ID: 8828100

Claim:
A system for coloring keratin fibers, comprising: a. a first composition comprising at least one catechol-based color precursor or a pharmaceutically acceptable salt thereof and at least one pharmaceutically acceptable base is an organic base, a carbonate or bicarbonate; and b. a second composition comprising at least the pharmaceutically acceptable base; wherein at least one of the compositions further comprises at least one of a metal salt chosen from Fe(III), Fe(II), Co (II), Co(III), Ag(I), Ti(II), Cu(I), Cu(II), Cr(II), Cr(III), Mo(II), Mo(III), Ni(II), Ni(III), Mn(II) and Zn(II) wherein the catechol-based color precursor is of the formula: wherein R 1 and R 2 can be the same or different and are selected from the group consisting of H, alkyl of 1-6 carbons, NH 2 , OH, silicon radicals, COOR′ wherein R′ is alkyl of 1-6 carbons or H, CONH 2 , halogen, OR″ wherein R″ is alkyl of 1-6 carbons, CH 2 OH, CH 2 NH 2 , and CONR′R″ wherein R′ and R″ can be the same or different and are as defined above; R 3 is selected from the group consisting of H, alkyl of 1-6 carbons, and COR″ wherein R″ is as defined above; R 4 and R 5 can be the same or different and are selected from the group consisting of H, alkyl of 1-6 carbons, NH 2 , OH, COOH, CONH 2 , halogen, OR″ wherein R″ is as defined above, NO 2 , SO 3 , silicon radicals, HNR″ wherein R″ is as defined above, and NR′R″ wherein R′ and R″ can be the same or different and are as defined above; or any pharmaceutically acceptable salts thereof or mixtures thereof.