Generally, its state is grass powder, yellow-green powder and grass flavor. It is impossible to dye white hair black, but only red.

Brief introduction of henna powder hair dye;

There are two forms of henna: tropical shrubs and temperate herbs. Under the conditions of high temperature, low humidity and sufficient sunshine, henna leaves can synthesize more and more bright reddish-brown pigments and hair care substances.

2. henna dyeing powder has been used for thousands of years, not developed in modern times. It grows in northwest India, Egypt, Yemen and other places, belonging to the family Lysimachiaceae. Its leaves and stems contain orange-red molecules, thus producing orange-red.

3.2065438+In September 2003, the EU Science and Technology Commission published a 44-page research report on henna powder dyeing. The report concludes that nail pollen staining has no side effects and is safe.

4. Articles cited by Chinese Academy of Sciences show that henna, also known as foam flower, is one of the earliest known plant cosmetics.

5. There is a similar variety called Impatiens in China, but it belongs to Impatiens family and contains similar pigments and orange-red molecules, but its pigment is not as full as that in tropical areas, so it is not suitable for dyeing hair.

Impatiens were first used in court in China in the Tang Dynasty, such as Song of the Palace Baby by the poet Li He in the Tang Dynasty, Autumn by Zheng Kui's wife in the Tang Dynasty, Zan by Zhang Hu in the Tang Dynasty, Jin Fenghua by Yang Wanli in the Song Dynasty, Yang Wei in the Yuan Dynasty and Song Qing's Drunk Flowers.