So, if you're bleaching more than just your roots, apply the bleach everywhere but the roots for the first 20 minutes and then go back. 2. Start at the crown of the head. Work down through the sides, front, and back. Do the same thing on each section, bleach both sides. 3. 1. Be Realistic About Bleaching Your Hair. No matter what, going platinum blonde will damage your hair to an extent. Sorry. Lightening your hair to white-blonde levels requires the use of either Step 1: Bleach mid-length to ends. Apply 20 vol. bleach and plan to let process for 30-45 minutes, depending on how light your natural base color is. Darker hair may need the full 45 minutes. Be sure to stop applying one inch from the scalp. The first step in bleaching black hair is to strip away the natural color with a bleach or peroxide. This can be done with a store-bought kit or with a homemade mixture of hydrogen peroxide and baking soda. Once the natural color has been stripped away, the bleaching process can begin. Yes, you can absolutely bleach box-dyed hair, but you have to go about it carefully. Bleaching box-dyed hair can be a gamble. You may get odd and unexpected results if you have repeatedly dyed over colors. It is difficult to go from dark to light, so if you expect to go from black box dye to platinum blonde in one session, you’ll likely be Using regular household bleach and not the recommended dyes or chemicals can damage your hair in the long-term. A few days before you use the bleach, take 0.25 tablespoon (3.69 ml) of the bleach and combine it with about 0.25 cup (about 59 ml) of shampoo. Stir this mixture together with a spoon. Step 2: Toner. The next step, which I did immediately after shampooing out the bleach (but no conditioner), is toner. If you already have blonde hair, you can skip right to toner to cancel out any Stripping is the process of breaking apart the bonds between hair dye and the melanin that gives you your natural color. Stripping doesn’t lighten your natural hair color, only the hair dye. If yNnWkJ.