Eumelanin provides natural colors ranging from red and ginger to yellow and blond tones.

The negative or positive pole of an electric current is referred to as the:

There are 60 naturally occurring elements, each with its own distinct physical and chemical properties.

A measurement of how much electricity is being used in 1 second is a(n):

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

In the croquignole method of wrapping, the hair is wound from:

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

Infusing water-soluble products into the skin with the use of electric current is known as:

Ammonia-free waves use an ingredient other than ATG, such as cysteamine or mercaptamine.

The most common neutralizer is hydrogen peroxide.