Using the Electric Lizard semi - permanent hair dye is easy. First, make sure to lighten your hair to the lightest level 10 blonde for the best color result. Then, apply the cream - formula dye evenly to your hair. Leave it on according to the instructions on the package. After that, rinse your hair thoroughly. Before you start using this product, it's very important to do a patch test on a small area of your skin. If you notice any redness or itching during the patch test, don't use the product. To maintain the color of your hair, use a color - protecting shampoo and conditioner. Avoid excessive exposure to sunlight as it can fade the color. With proper care, your bright neon green hair will stay vibrant for a long time.