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Bleach is Important before Colour your Hair. Hair Bleach is a Powerful product capable of dramatically changing the appearance of your hair. If you have dark hair and want to dye it blonde, you need to be able to use Bleach. Step 1 - To Prepare Bleach, Mix the Developer with Gemblue Biocare Bleaching Powder in Non Metallic Bowl. Step 2 - Apply Bleaching Mixture evenly to dry hair. Leaving the Bleach in the Process is largely dependent on your goal. Step 3 - Rinsed out Thoroughly with plenty of cool water before you shampoo your hair.