To use this Crazy Color Violette hair dye, first, do a strand and sensitivity test. Then, shampoo your hair with a pH - neutral shampoo and don't use conditioner. Towel - dry your hair. Apply the dye directly while your hair is still damp, spreading it evenly and wearing gloves. Leave it on for 15 to 30 minutes, then rinse thoroughly until the water runs clear. Remember to patch - test any new product before regular use. If you experience redness or itching, stop using it. To maintain the colour, avoid dandruff or harsh shampoos. Use a sulphate - free or colour - friendly shampoo and wash your hair as little as possible. Rinse your hair with cold water after shampooing to seal in the colour. Also, stay away from too much direct sunlight and swimming in chlorinated water as they can strip the colour from your hair.