This is an intense black / dark blue hair dye and it is a multipurpose wonder. If you want to add some extra depth to a lighter colour, Black is the perfect solution. It also works great for simple raven black hair. This product is suitable for all hair shades. Follow these steps to achieve your desired look! STEP 1 Crazy Color works best on hair that has been pre-lightened to level 9 or 10. STEP 2 After shampooing the hair and towel drying, apply chosen Crazy Color, beginning at the roots and working in sections STEP 3 Spreading evenly from the roots, begin to work it out through to the mid lengths of the hair. STEP 4 Once the roots to tip of the hair is covered, work the color into each section using the hands until the product starts to froth slightly, and each section is saturated. STEP 5 Once the product application is complete, leave for 15-30 minutes depending on your hair condition. For grey coverage, leave the color on for 1 hour for maximum development time. STEP 6 Rinse with lukewarm water only, without shampoo and follow withRainbow Hair Conditioner.The color will last 10 washes when correct aftercare is followed.