To use this Crazy Colour lilac hair dye, first do a strand and sensitivity test. Then shampoo your hair with a pH neutral shampoo, don't use conditioner, and towel dry. Apply the dye directly on damp hair with gloves, spreading it evenly. Leave it for 15 to 30 minutes, then rinse thoroughly until the water runs clear. For maintenance, avoid dandruff or harsh shampoos as they can quickly strip the colour. Use a sulphate - free or colour - friendly shampoo and wash your hair as little as possible. After shampooing, rinse with cold water to seal in the colour. Also, stay away from too much direct sunlight and swimming as chlorine and sunlight can fade the colour. Always patch - test any new product. If you experience redness or itching, stop using it.