Than to dye a hair?
of Means, applied to decolouration and coloring of hair, subdivide into four groups. These are the decolouring dyes, chemical, ottenochny and vegetable dyes. In separate group emit the dyes containing salts of metals however now them do not use.
Dark hair it is impossible to recolour in lighter tone, previously without having clarified them. It can be made by means of the special clarifying substances. They decolour dark hair on 3 - 5 tones and more.
The first group of substances - the bleaching or decolouring structures , apply with an oxidizer. As an oxidizer apply hydrogen peroxide (hydrogen peroxide, pergidrol, H202). It is the colourless liquid decaying with formation of water and oxygen. Reacting with a pigment of hair, the oxidizer partially or completely destroys it. At partial destruction hair are clarified, and at final fracture - become colourless.
The decolouring structures allocate in separate group not only because they are used practically at all methods of coloring of hair, but also independently.
And as any clarifying structure possesses to a greater or lesser extent the destroying action, after their application it is necessary to wash the head with soft shampoo and to use balm, and even means for treatment of hair.
The second group of dyes - so-called chemical dyes . They enter chemical reaction with a keratin of hair, changing its color. These dyes also apply in a combination with hydrogen peroxide. They provide strong permanent hair-dyeing, chemically taking root into their structure after partial destruction of a pigment.
However their use strongly affects on health of hair. In this regard it is desirable to limit their application, using unless only for uniform and permanent coloring of a gray hair. In other cases it is better to use more sparing dyes of the third group.
The third group, them sometimes call physical dyes are chemically inactive substances. Here the tinting and tinting shampoos, conditioners, skins and balms enter. These dyes influence only a surface of hair, without entering chemical interaction with a keratin.
Coloring durability in many respects depends on a condition of hair and their porosity. On a hard hair with low porosity dye accumulates on an external layer therefore durability of coloring is low, paint is easily washed away.
If hair porous, dye quickly gets into deep layers of hair and fills the available emptiness from where to wash up them quite difficult.
Dyes of the third group use for minor change of a hair color, considerably they cannot change color or paint over a gray hair.
From dyes of the third group widely apply coloring shampoos as they possess the sparing action, recover hair, return natural gloss to the hair which faded, burned out on the sun, give to hair a certain shade.
And still they should be applied with care. It is not necessary to wash with coloring shampoos the decoloured and strongly gray hair, it is possible to receive unexpected result, an unnatural, or slovenly hair color. Hair will look especially bad if their roots have badly painted over gray-haired sites in contrast with the painted dark hair.
Ottenochny means apply to short-term giving of a new shade to hair. They create quickly washing away colored film on a surface of hair.
On dark hair their effect is almost imperceptible. What a difference a fair hair, is well excreted for them dyes of red tones.
Soft paints contain not enough oxidizer. They are more resistant, than coloring shampoos - are gradually washed away only through 10 - 20 times. At the same time the difference between the dyed hair and the grown roots is not so noticeable.
The fourth group includes the natural or natural dyes which are not changing structure of hair at all. They get deep into a hair thanks to biologically active agents, strongly take root into hair, provide very permanent coloring, and at the same time and treat.
It would seem what else to wish? However coloring by them very difficult process demanding high qualification of the master. These dyes so resistant that it is very difficult to correct an error in coloring.
The most known dyes of the fourth group are henna and a basma. Henna paints hair in red tone, a basm - in black, the basma without henna is not applied as black color which it gives in itself looks unnatural.