| 主权项 |
1. 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 R1 and R2 can be the same or different and are selected from the group consisting of H, alkyl of 1-6 carbons, NH2, OH, silicon radicals, COOR′ wherein R′ is alkyl of 1-6 carbons or H, CONH2, halogen, OR″ wherein R″ is alkyl of 1-6 carbons, CH2OH, CH2NH2, and CONR′R″ wherein R′ and R″ can be the same or different and are as defined above; R3 is selected from the group consisting of H, alkyl of 1-6 carbons, and COR″ wherein R″ is as defined above; R4 and R5 can be the same or different and are selected from the group consisting of H, alkyl of 1-6 carbons, NH2, OH, COOH, CONH2, halogen, OR″ wherein R″ is as defined above, NO2, SO3, 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. |
