How Much Developer Do I Mix With?
The amount of developer you mix with depends on the type of hair color you are using, as well as the desired result. Generally, for permanent hair color, the ratio of developer to color is 1:1, meaning equal parts of each. However, for demi-permanent hair color, the ratio is usually 1:2, meaning twice as much developer as color. It is important to always follow the manufacturer’s instructions and measure accurately to ensure the best results.