To use Arctic Fox Phantom Green hair colour, first make sure your hair is pre - lightened for the most vibrant results. If you have darker hair, it'll still get a lovely emerald tint. Before applying, always do a patch and strand test. Mix the dye according to the DIY formula. Apply it evenly to your hair and leave it on for the recommended time. Rinse thoroughly until the water runs clear. Since it's a semi - permanent dye, the color will fade over time. To maintain the color, use sulfate - free shampoos and conditioners. Avoid excessive sun exposure as it can cause the color to fade faster. If you want a different jewel - toned look, try mixing Phantom Green with Aquamarine. Have fun and rock your new hair color!