Last but not the least comes black. Often derived from very dangerous sources like used batteries, this colour may cause a lot of trouble later. However, for a safe black colour boil dried fruits of Indian Gooseberry (Amla) in an iron vessel and leave it overnight. Dilute with water and use.
Other methods:Extract the juice of black grapes and dilute with sufficient quantity of water to remove stickiness.
Image Courtsey: trade.indiamart
Have a safe and organic Holi!
-By Mekhla Singh