CPC A61K 8/9789 (2017.08) [A61Q 5/10 (2013.01); A61K 2800/4324 (2013.01)] | 7 Claims |
1. An indigo darkener, comprising:
an indigo dye: 20-40 parts by weight;
an alkaline dyeing assistant: 5-10 parts by weight;
an acidic dyeing assistant: 4-20 parts by weight;
an oxidizing agent: 2-10 parts by weight; and
a dyeing supplement: 0.5-20 parts by weight.
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