HAIR DYE

 HAIR DYE:

•RAW MATERIAL:

In general,hair dyes include:

1. Dyes e.g 4-amino-2-hydroxytoluene

2. Modifiers e.g.resorcinol

3. Antioxidants e.g. sodium sulfite

4. Alkalizers e.g. ammonium hydroxide

Beyond these chemicals, many different chemical are used to impart special qualities. They may be shampoos, fragrances, chemicals that make the formula creamy,foamy,or thick, or contribute to the overall action of the formula.

•DIFFERENT TYPES OF HAIR DYE:

There are three types of hair dyes.

•Permanent: Causes some lightening of hair, contains 3-6% hydrogen peroxide, contains oxidative dyes that form during application, does not wash out significantly but may fade.

•Semi-permanent: causes mild lightening of hair, contains 1-2% hydrogen peroxide, contains oxidative dyes that form during application, last around 6 weeks.

•Temporary  dye(direct dye): no lightening of hair, does not contain peroxide, contains dye that are already formed before application, washes out in a few washes.