Using Manic Panic's Electric Banana hair dye is easy. First, make sure to lighten your hair to the lightest level 10 blonde for the most vibrant results. Then, apply the cream - based dye evenly through your hair. Leave it on for the recommended time on the package. Rinse it out thoroughly. Before using this product for the first time, do a patch test on a small area of your skin. Wait 24 hours. If you experience redness or itching, don't use the product. To maintain the colour, use a colour - safe shampoo and conditioner. Avoid excessive exposure to sunlight and chlorine as they can fade the colour faster. With proper care, you can enjoy the long - lasting, neon - yellow shade of Electric Banana for a great look.