What influences the length of time necessary to lighten the natural hair color?

A virgin application refers to the first time the hair is colored.

What determines how the hair will react to the color formula and how long the formula should be left on the hair?

What are powdered lighteners that cannot be used directly on the scalp?

A patch test must be given 10 to 24 hours before coloring the hair.

The majority of permanent haircolor products use 10, 25, 30, or 40 volume hydrogen peroxide for proper lift and color development.

What are used primarily on pre-lightened hair to achieve pale, delicate colors?

In a two-step process the 1st step is to pre-lighten, and the 2nd step is to tone.

What volume peroxide would you use with permanent color for gray coverage?

What adds shine and color to the hair?