Using Arctic Fox Aquamarine hair colour is easy! First, make sure to do a patch and strand test before you start colouring to avoid any allergic reactions. If you have pre - lightened hair, the colour will turn out more vivid, but it can still work on unbleached darker hair. For a brassy - toned blonde, mix a little bit of Purple Rain with the Aquamarine for a perfect cobalt or deep indigo. Just apply the hair colour evenly to your hair, leave it on for the recommended time, and then rinse it out. Since it's a semi - permanent dye, the colour will fade over time. To keep it looking fresh, use a sulfate - free shampoo and conditioner. And remember, this is a vegan, cruelty - free product, so you're making an ethical choice while looking great!