People usually color their hair in order to enhance their looks. By way of example, it is common to find elderly people coloring their head of hair black as a way to look younger far better looking. The key chemical ingredients active in the coloring process are peroxide and ammonia.

Peroxide (an oxidizing agent) usually is available in varying forms and strengths and aids in initiating large forming process. Mit also aids in making a long lasting color.
The harder the quantity of peroxide in the dye, greater the amount of surfur taken out of hair. Lack of surfur results in hardening of hair and lose of weight.
Ammonia for the hand acts as a catalyst once the permanent hair color combines with bleach. The same as all alkaline products, ammonia aids in separating the cuticle and allows the hair color to enter the head of hair cortex.

Depending on the amount of these chemicals from the dye, hair dyes are classified into three main categories: temporary, semi-permanent and permanent dyes.
Temporary hair dyes are generally used when you are choosing special events including Halloween parties and also other events. These dyes are usually present in gels, sprays, foams, rinses and shampoos.
In many instances, the pigment particles of these dyes are large plus they can't go into the cuticle layer; the particles remain adherent on the hair shaft which can be usually easily removed simply with just one shampooing.
Semi-permanent hair dyes coat the hair shaft plus alter the hair color temporarily to various shades of red, blue, and pink. If you apply them, the dyes are 6-10 washes so you don't need to mix them other components.
The pigment particles of the dyes usually are small in proportions plus they easily penetrate from the hair cuticles.
Permanent hair dyes are employed if you want to take out the pigment of natural hair and put it back to colors. The particles in the dye are usually tiny in size thus they easily enter the cuticle and consequently they bring about about permanent alternation in hair color. This is actually the best dye when you wish to pay for your grey hair.
These are the main dyes that can be used to create hair. You should note that even though dyes work well inside their working, they can cause harm to hair. The dyes can even be allergic for your skin therefore make you really really irritating when you wear them.
For that reason you ought to be careful and make certain that you always test the merchandise before with them.
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