Appearance of hair

The hair colour depends on a set melanotsitov in a hair follicle. Melanin which they develop, is postponed in horn cages in process of their movement from a root upward. And colour depends on what their quantity is formed during hair growth. As the person grows old, activity melanotsitov falls — as a result of it there is grey hair. These hair as are healthy, as well as what keep former colouring.

Colour as well as other characteristics of hair — a thickness, fat content, a sinuosity, — is hereditary. At the people living on caucasus, dark, wavy hair, rather than direct and light are is genetically more often put in pawn. It means, that if someone inherits a gene dark and a gene of a curly hair it will have a dark curly hair even if simultaneously inherits also genes of light direct hair. It is necessary to tell, however, that laws which operate a heredity, are extraordinary difficult, and dominating genes neodinakovy at different races. At Africans, for example, the hair braided in a spiral with progressively decreasing diameter, dominate over straight lines, but often there are also helicoid hair at which its diameter is constant.

You can change the appearance, having recoloured hair or having made a permanent wave. At colouring the thin layer of a chemical compound is put on hair. Duration of preservation of artificial colour depends on how deeply the paint will get into hair. Some painting shampoos support colour within a week, others change it for a long time until hair will not be sostrizheny. The permanent wave destroys chemical bonds which support level keratina in hair, and reconstructs them. Traditionally permanent wave and chemical paints contain strong alkalis and change natural acidity of hair.

The structures invented recently, contain substances which as it is considered, protect natural acidity of hair and have lower maintenance of ammonia. It can reduce somewhat harmful influence which is rendered by these preparations on hair, but nevertheless to use them follows with care. Their wrong use can temporarily spoil hair: they become dim, curly and fragile. Therefore it is better to descend to the professional hairdresser or very carefully to carry out all instructions on application of the given means of the house. One more reason on which it is necessary to concern with care use of a paint for hair, consists that as have shown laboratory experiences on animals, communication existence between some chemical substances containing in a paint, and such disease as a cancer is possible. The administration under the control over a foodstuff and medical preparations of the USA has made the decision, that all dyes containing derivatives of coal pitches, should be on sale with the prevention concerning possibility of similar influence. Therefore, if you use similar paints, it makes sense to paint only separate locks of hair that chemical substances did not adjoin to a skin of a head and did not get inside. Vegetative dyes, such as henna, are more safe, than chemical, and have sparing influence on hair.