Do a skin test to test for allergic reactions (after mixing a bit of the powder and developer). Leave on for 24 hours. If there is no allergic reaction (rashes or itchiness), it's safe to apply the product to your hair.Make sure there are no scalp injuries (wounds or lice) and that your hair is in good condition.Using a small container/bowl, mix the powder with the developer evenly in a ratio of 1:2.5Let it settle for 5 minutes before applying.For a more vibrant color, use tin foil for heat distribution to bring out the color.Leave in for 30-45 minutes before rinsing it off."}]