What does the phrase 20 volume will lift hair 2 levels mean?

The phrase "20 volume will lift hair 2 levels" refers to the use of a 20 volume developer in a hair coloring process to achieve a specific level of lift or lightening of the hair. Here's what it means:

Volume in Hair Coloring:

In hair coloring, volume refers to the strength of the developer used. The developer is a chemical agent that activates the hair color and helps it penetrate the hair shaft. Different volume developers are available, each producing different levels of lift or lightening on natural hair.

20 Volume Developer:

A 20 volume developer is relatively strong compared to lower volume developers. It contains a higher concentration of hydrogen peroxide, which is responsible for breaking down the natural pigments in the hair and lightening it.

Lift Hair 2 Levels:

When using a 20 volume developer, it can typically lift the hair color by 2 levels. This means that the hair will become noticeably lighter compared to its natural color. For example, if someone starts with a dark brown hair color (level 3), using a 20 volume developer can lighten it up to a medium brown color (level 5).

It's important to note that the actual level of lift achieved may vary depending on several factors, including the starting color of the hair, its porosity, and the desired result. Additionally, it is always recommended to follow the instructions provided by the hair color manufacturer and consult with a professional hairstylist to ensure the desired results and avoid any damage to the hair.