The 20 vol strength is a medium-strength solution that can lighten hair up to two shades or add color. It's important to follow the instructions carefully when using peroxide on your hair to avoid damaging it.

Hi-test cream peroxide 20 vol is a type of hair developer solution that is typically used in hair coloring or bleaching treatments. It contains hydrogen peroxide, which helps to open the hair cuticle and allows the color or bleach to penetrate the hair shaft. The "20 vol" refers to the volume of oxygen released by the hydrogen peroxide, which is measured in units called "volumes." In this case, 20 vol means that the solution will release a moderate amount of oxygen, making it a good choice for lightening hair up to two shades or for depositing color. Hi-test cream peroxide 20 vol is typically mixed with hair dye or bleach powder to create a paste-like mixture, which is then applied to the hair. It's important to follow the instructions carefully and perform a patch test before using any hair color or bleach product to avoid allergic reactions or damage to the hair.