Framesi Ossidorr Hair Emulsified Oxidizer, Super 40, 946ml developer allows the color to produce your expected outcome by opening the cuticle for the color to incorporate, resulting in shiny and even color coverage. Additionally, it disperses the current color and can lift hair color level depending on the strength of the hydrogen peroxide formulation. The 40 volume developer is the strongest and has the potential to produce significant changes. It will lift your hair four shades and is suitable for blondes, especially high-lift colors. You can use 40 volume developer when you want to achieve a medium to dark blonde. You can also use it with bleach for better results.