| 摘要 |
<p>A process of dyeing a leather substrate comprising applying to the leather substrate a mixture of at least one compound of the formula <IMAGE> and at least one compound of the formula <IMAGE> wherein each R is independently <IMAGE> wherein: R3 is hydrogen, -SO3M or -COOM, and R4 is hydrogen, C1-4alkyl or C1-4alkoxy, each R1 is independently a coupling component radical, and each n is independently 1 or 2, wherein each M is independently hydrogen or a cation.</p> |
