Is indigo powder is safe for hair?

Zenia Indigo Powder (Indigofera Tinctoria) Hair / Beard Dye Color 1000 Grams (1kg)

10 Best Indigo Powder Hair Benefits - How To Use Indigo Powder – VedaOils

Keeptribe Organic Indigo Powder For Better Hair Care & Color – Keeptribe Organic

Organic Indigo Hair Dye Powder – itsherbalmagic

Bio-Organic Indigo Powder for Hair Colour – Indus Valley

(TWO STEP PROCESS - A) For BLACK tones, use 100% henna first and then second step of indico. at 100% (two step). B) For REDDISH BROWN, use a 75% henna

Indigo & Henna Powder Organic for Hair Colour -100 Grams each -Natural Mehndi

Is indigo powder a safe hair dye? - Quora

What Is Indigo Powder and Henna - Kama Ayurveda

Indigo Powder For Hair - Full Tutorial

Bio-Organic Indigo Powder for Hair Colour – Indus Valley

Indigo Powder for Hair Dye 100 Grams 3.57 Oz. Hair Coloring

Worried About Greying and Falling Hair? Try These Henna and Indigo Powder Hair Masks

Bio-Organic Indigo Powder for Hair Colour – Indus Valley