CH 20 Pretest

The natural pH of hair is between 4.5 and 5.5.

Disulfide bonds cannot typically be broken by water.

You should always perform an elasticity test before perming a client's hair.

Alkaline permanent waving solutions tighten the cuticle, causing the hair to contract and curl.

When perming porous hair, you should use a highly alkaline permanent waving solution.

In permanent waving, most of the processing takes place toward the end of the processing time, after about 15 to 20 minutes.

When perming a client's hair, you should rinse the hair with a strong blast of hot water.

When wrapping hair for a perm, you should always wrap against the natural growth pattern.

Normalizing lotions have an acidic pH.

When performing a hair relaxing service, you should never apply a hydroxide relaxer on hair that has been previously treated with a thio relaxer.