| 摘要 |
<p>Hair coloring compositions comprising: (i) one or more developers selected from amino aromatic systems capable of being oxidized and thereafter undergoing a single nucleophilic attack, and (ii) one or more couplers selected from (A) (1) naphthols having an active leaving group in the para-position relative to the -OH group, or (2) phenols with an active leaving group which is hydrogen which is para to the -OH group, (B) 1,3-diketones, or (C) pyrazolones, such that in the presence of an oxidizing agent the or each developer reacts with the or each coupler substantially only at the position having the active leaving group.</p> |
