Using our Phantom Green hair colour is easy. First, make sure to do a patch and strand test at least 48 hours before you plan to colour your hair. This helps you avoid any allergic reactions. If you have dark hair, pre - lightening it will give you the most vibrant results. Once you're ready, put on some gloves and apply the hair colour evenly to clean, dry hair. Leave it on for the recommended time according to your hair type. After rinsing, you'll notice your hair has a beautiful green hue. To maintain the colour, use a colour - safe shampoo and conditioner. Avoid hot water and excessive sun exposure as these can fade the colour faster. If you want a different shade, you can mix Phantom Green with Aquamarine. And remember, this is a semi - permanent dye, so the colour will gradually fade over time.