How To Bleach Dyed Hair. 1) mix hair bleaching powder with 20 or 30 or 40 volume hydrogen peroxide in a ratio of 1: 10 volumes are ideal for weaker hair and 20 volumes for healthy hair) to one part of powder bleach, in a bowl.
A bleach wash—also known as a bleach bath—is a gentler way to bleach your hair than a full head bleach because the product is diluted when applied to your hair. Add two parts of shampoo to the same bowl.
10 Amazingly Simple Ways To Lighten Your Hair Naturally
Apply a deep hydration mask 48 hours before bleaching your hair. As it has taken years of abuse i realise this will not happen over night.