Indigo powder is generally used with nail pollen. Indigo powder is not recommended for use alone. Indigo powder and nail pollen can be used for pure plant dyeing and chestnut brown dyeing: 1. Pure plant dyeing: first dye with nail pollen, and then dye with indigo powder. Pure plant dyeing can be used, but it is not excluded that individual hair problems may lead to yellowing. 2. Chestnut brown: first dye with henna.