When you are looking to create highlights without bleach using high-lift hair color. This developer contains 12% hydrogen peroxide, and it lifts your hair color up to eight levels. Volume Oxydant Developer only used for lightening hair. Since it is the strongest developer, if you are bleaching dark brown or black hair you may also need to use 40 volume developer, it is not recommended to be used at home due to the risk of burning your hair and/or scalp. If you think you need to use this developer to get your desired hair color, get your hair colored by a professional hair colorist. Strength: 40 volume developer is the strongest developer available for hair color and lightening processes. It contains a higher concentration of hydrogen peroxide compared to lower volume developers.