Using this Manic Panic Amplified Semi - Permanent Cream Hair Color in Voodoo Blue is easy. First, bleach your hair if you want the purest color result. Then, apply the hair color evenly to your hair. Leave it on for the recommended time according to the instructions. After that, rinse it out thoroughly. Remember, always do a patch test before using the product regularly. If you notice any redness or itching during the patch test, don't use the product. To keep your hair looking great, avoid using very hot water when washing your hair, as it can cause the color to fade faster. Also, use a color - protecting shampoo and conditioner. This hair color can last longer with proper care, so enjoy your beautiful Voodoo Blue hair!