US 11,744,794 B2
Indigo darkener and hair dyeing process
Zikui Song, Jilin (CN)
Appl. No. 17/619,448
Filed by Zikui Song, Jilin (CN)
PCT Filed Mar. 5, 2020, PCT No. PCT/CN2020/077895
§ 371(c)(1), (2) Date Dec. 15, 2021,
PCT Pub. No. WO2020/177730, PCT Pub. Date Sep. 10, 2020.
Claims priority of application No. 201910171616.8 (CN), filed on Mar. 7, 2019.
Prior Publication US 2022/0401351 A1, Dec. 22, 2022
Int. Cl. A61Q 5/10 (2006.01); A61K 8/9789 (2017.01)
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.