Permanent Oxidation Colours
These are the most popular today and are truly permanent colours. The term oxidation is applied to these dyes because the final colour in the hair is produced by an oxidation reactions. Henna however is a 'permanent dye' with the colour being oxidised by atmospheric oxygen. Henna may change the feel and lustre of hair.
The permanent colours, changes the natural pigmentation of the hairs, by using the ammonia and oxidising agents. The ammonia is considered as a very harmful chemical for the hairs. The main disadvantage or drawback of the permanent oxidation colours is that it requires regular retouching at the roots, every four to six weeks, as hair grows around 1cm a month.
The Oxidizing Agent or Developer is hydrogen peroxide in one of various forms and strengths. lt is the catalyst or cause of the chemical reaction which allows the formula to permanently alter the hair's color. The bleaching boosters, can be added to increase lifting action.
The permanent oxidation colours or simply oxidation colours are known as 'para' dyes. They require an oxidising agent e.g. hydrogen peroxide to function. These dyes include:
The main advantage of the permanent oxidation colour, is that thay are ideal for a long term change and covering the grey hairs for long times. They penetrates the hair, causing an oxidation reaction, which permanently changes the hair's colour.
Color and Highlight Care Tips and Techniques:
The important tips are as:-
Ammonia:- Ammonia is used in permanent (oxidative) haircolor. When the permanent haircolor and the developers come together, the action of ammonia begins. The ammonia has an effect on the sulfur bonds of the hair. If the ammonia is too harsh, the hair will lose more of the sulfur bonds than necessary. It will cause the hair to harden, lose weight and diameter.
Developers:- The higher the volume of the developer, the greater the amount of sulfur is removed from the hair structure. They will act especially on the granular pigments and will act progressively as the action of the decoloration takes place.
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