People have been using indigo for 4000 years to dye hair, mixed with henna or when dying black on its own. It became known as "black henna" in the 19-20. century in Europe and America. This incorrect name is originated from the similar appearance: it is a green powder just like henna, but it makes the hair dark or black depending on the original color instead of making it red as henna.
Important: Keep out of reach of children! Avoid eye contact! Do not swallow!
Indigo color is well kown because denim is traditionally dyed with it.
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