How to make grey hair black permanently?

Question

Durga Mua · Answer

Amla and methi seeds. Add 6-7 pieces to 3 tbsp of an oil of your choice (coconut, olive, almond) and boil for a few minutes. Add 1 tbsp of fenugreek powder. ...
	Black tea rinse. Boil a cup of water with 2 tbsps of black tea and a tsp of salt.

Q: How to make grey hair black permanently?