Question: how to use peroxide and baking soda to lighten hair?
Answer: Combine Baking Soda and Hydrogen Peroxide to Make a Paste Combine one cup of baking soda with three tablespoons of hydrogen peroxide, mix it up and apply to your hair. Leave the mask on for 30 to 60 minutes (but no more than 60 minutes) and your hair will turn out 1-2 shades lighter!