chemical named paraphenylenediamine. Presently hair color works as a series of chemicals react between the hair molecules, pigments and peroxide and ammonia. The natural hair colorants generally make use of natural pigments from plants and minerals. The natural colorants mostly make use of henna and black walnut shells. Henna added with coffee and henna kept over night in a copper container are also being increasingly used as ingredients in hair colors. It also acts as a very good conditioner for hair. A few of the natural hair colorants though they survive through several sessions of shampoos but present research shows that they may not be any more safer for your hair than the chemical colorants available in the markets nowadays. Temporary hair colors tend to deposit acidulent dyes outside the hair shaft or they may have small pigment molecules which can easily slip in to the hair shaft. Shampooing eventually displaces the shades of temporary hair color. The temporary colorants don't have ammonia content, and the natural color of the hair is retained once the product washes out.
Bleach works as a good hair lightener as it reacts with the hair melanin and removes hair color through an irreversible chemical process. Bleach oxidizes the melanin molecule which is rendered colorless and the bleached hair tends to turn pale yellow (color of the normal keratin). Bleach reacts more with the dark eumelanin pigment resulting to some gold or red residual color remaining after hair lightening. Hydrogen peroxide is one of the most common lightening agents. The alkaline solution opens the hair shaft and allows the peroxide to react with the melanin. For the application of permanent hair color, the hair cuticle or the outer layer of the shaft has to be opened first. A two step process is used for permanent hair color by first removing the original color and then depositing the artificial color. The permanent hair colors have ammonia content for the alkaline to react with the hair cuticles. After peroxide reaction, the hair melanin is de-colorized and the new color is glued to the cortex of the hair. During the process the conditioners close the hair cuticle in order to seal and protect the artificial color. The most prominently used hair colors are copper, burgundy, brown etc. The best hair color products are offered by Garnier, Schwarzkopf, L'Oreal, and Streax. These products are the best in the international market and they ensure the protection of your hair from adverse reactions.