The layer of the hair that provides te strength and elasticity of human hair is the ___.

The natural PH of hair is between ___.

In permanent waving, the size of the curl is determined by the ___.

The technique of wrapping hair at an angle of 90 degrees or perpendicular to its base section is ___.

The two basic types of wrapping the hair around a perm rod are the spiral and ___.

A reduction reaction involves either the addition of hydrogen or the removal of ___.

Most cold waves have a pH between ___.

The three separate components of acid waves are the permanent waving solution activator, and ___.

An endothermic wave is activated by ___.

Permanent wave solution should be rinsed from the hair for at least ___.

The process of rearranging the structure of curly hair into a straighter or smoother form is ___.

Thio relaxers usually have a pH above ___.

Hydroxide ions left in the hair after a relaxer can be neutralized using a(n) ___.

Which type of relaxer contains only one component and is used exactly as it is packaged with no mixing necessary?

Lithium hydroxide and potassium hydroxide relaxers are often advertised and sold as ___.

Which type of bonds are relatively weak physical side bonds that are the results of an attraction between negative and positive electrical charges?