The path of an electric current from the generating source back to the original source is a(n):

A wall plate is also known as facial stimulator.

Cold cream is an example of an oil-in-water emulsion of two immiscible liquids.

Rubber, silk, wood, and glass are common examples of:

The process of chemically altering the natural wave pattern of hair is:

The most common reducing agents used are:

In permanent waving, the size of the rod determines the size of the curl.

Chemical services should not be performed if the scalp analysis shows any signs of:

The cortex layer of the hair structure is responsible for the hair’s length and texture.

Chemical side bonds formed when two sulfur-type chains are joined together are: