To use this Manic Panic Pillarbox Red semi - permanent hair color, first bleach your hair if you want the richest color. Then, apply the cream - based formula evenly to your hair. Leave it on for the recommended time as per the instructions. After that, rinse it out thoroughly. Before using the product for the first time, always do a patch test on a small area of your skin. If you notice any redness, itching, or irritation, don't use the product. To maintain the color, use a color - protecting shampoo and conditioner. Try to avoid excessive sun exposure as it can fade the color. And remember, this vegan hair color is also great for conditioning your hair, so you'll keep your locks healthy while rocking that bright scarlet look.