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Types of Hair Color
The first commercial haircolor that was considered safe was created using the chemical paraphenylenediamine in 1909 by a French chemist. About 75% of women color their hair today. The process of coloring hair works through a series of chemical reactions between the molecules in hair and pigments, and in some formulas, peroxide and ammonia.
Temporary
Temporary hair color is usually used to brighten or add richness to the natural hair color. Or, temporary color can be used to achieve colors that are not typical of natural hair, like pink, blue and green. Because temporary hair color does not penetrate the hair shaft, it is easy to remove with a shampoo or two, it is not necessary to add additional color or bleach hair to replace a temporary color.
Semi-permanent
Semi-permanent color works without changing the hair's natural color because it contains no ammonia or peroxide and the color molecules don't interact with the hair's natural pigments. The molecules in semi-permanent hair color are small and will wash out with several shampoos, leaving the hair as it was before treatment. Semi-permanent color is great for covering some grey hair, doesn't leave the appearance of a root line, and can last up to 12 shampoos.
Demi-permanent
Demi-permanent color lasts a little longer than semi-permanent color, up to 26 shampoos, without the use of ammonia. Though this level of hair color will not lighten the hair, a small amount of peroxide is used to get a brighter, more enhanced color and gray coverage. Demi-permanent hair color will have varying results on hair that is already colored or permed hair.
Permanent
Permanent hair color is used to achieve a more significant color change. These products use both ammonia and peroxide so the resulting color cannot be washed out, the color must grow out. This product acts to lighten the hair's natural pigment to form a new base and then to add a new permanent color. The final color is a combination of natural hair pigment and the new shade.
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