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100% Gray Coverage Leaves Hair Nourished & Shiny Ammonia Free Description Please follow the box instructions closely. - The 3-in-1 Precision Brush is ideal for targeted application, starting at the roots with 1/2" chunks of hair. - After your roots have been saturated, work the rest of the mixture through the rest of your hair. - After the hair colour is applied all over, rake the comb side of our 3-in-1 tool from roots to tips for the most even distribution.