What does the term "volume" denote in hair coloring?

The term "volume," in the context of hair coloring, refers specifically to the strength or concentration of hydrogen peroxide used in the coloring process. This is a crucial element in determining how light or dark the hair will become after the coloring treatment. Different volumes indicate varying levels of lift and processing time, which affects the overall result of the hair color application.

For instance, a lower volume, such as 10 volume, is typically used for deposit-only coloring, meaning it will add color without lifting the natural hair color. Conversely, a higher volume, such as 30 or 40 volume, is employed for significant lifting, which is necessary when lightening hair. Understanding the role of volume in relation to hydrogen peroxide is essential for achieving the desired color results safely and effectively.