You should NEVER apply hair color to a client if the scalp has any obvious signs of ___.

When the cuticle is tight and the hair is resistant, it is difficult for moisture or chemicals to penetrate. What term describes this condition?

During the process of decolorizing, natural hair can go through as many as ___.

Each color is identified by a number and a letter, with the number indicating the level and the letter indicating the ___.

When applying color using the brush-and-bowl method, the mixing bowl should be ___.

The primary color that brings depth or darkness to any color is ___.

___ is described as a property of objects that depends on the light they reflect and is perceived (by the human eye) as red, yellow, blue, or other shades.

To test for porosity, take several strands from four different areas of the head: the front hairline, the temple, the crown, and the ___.

What hair coloring product is used primarily on pre-lightened hair to achieve pale and delicate colors?

Primary and secondary colors that are positioned opposite each on the color wheel are ___.

What is the first step of double-process haircoloring?

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