Natural healthlife care 100 % natural indigo powder (indigofera tinctoria) directions: its 100% natural product. Can be used on hair. Easy to mix with water due to its fine mesh, bo allergy as its pure and natural without any use of ppd. Apply it on henna colored hair to get jet black color. Mix it with henna to get dark brown to black shades on hair. Istructions: store in dry and moist-less place. Keep away from direct sunlight. Keep away from childrens, not to be eaten. For external use only.