Hydrogen peroxide (H2O2) is known as an oxidizing agent, one of its purposes is to swell the colour molecule after it penetrates the hair. Another of its purposes is to strip the hair of its colour
Hydrogen peroxide is available in different volumes.Here's an example of what 20 volume means:In a given amount of water, there are 20 times the normal amount of oxygen: this is what makes the peroxide 20 volume.
