| 摘要 |
<p>Aqueous hair dye preproduct contains 1,2,4-trihydroxybenzene, N,N-bis-(2-hydroxyethyl)-p-phenylene diamine and 2,4,5,6-tetraaminopyridine. An Independent claim is included for a hair dyeing process comprising contacting the hair with a preproduct as above without adding an oxidizing agent and developing the dye using atmospheric oxygen.</p> |
