Hair Coloring
April 10, 2009
It is quite fashionable to color hair these days, not only because it helps to hide hair that is turning gray, but also to follow current trends.
A trip through the local store aisles will uncover a wide variety of hair coloring products designed to give results for varying lengths of time.
Permanent hair color products have high concentrations of peroxide and ammonia designed to break down the hair by opening or cracking its outer layer, to ensure that the dye penetrates to the center of the thicker gray hairs for good.
These products do not affect the color of new hair growth, however, so there will soon be evidence of the gray again, close to the scalp.
Semi-permanent hair color products have lower concentrations of peroxide and do not contain ammonia. While they cause less damage, they do not completely hide natural coloring, generally providing about 80% coverage. The color fades gradually with washing, and will usually be gone after about two months.
Semi-permanent hair color products are the safest and gentlest on the hair. Having no ammonia and very little, if any, peroxide, these products will cover only about 10-50% of the natural coloring and are often used for fun and entertainment.
Their duration of coverage is about one to four weeks, depending on the frequency of washing. The color can usually withstand about four to six shampooing sessions before it fades completely.
Permanent hair coloring products are comprised of two components, the color, which can be in cream, gel or shampoo form, and the developer or oxidizing agent, which is available in the varying concentrations of peroxide mentioned above, depending on the longevity of the coloring.
When the peroxide or developer comes in contact with the inner portion of the hair root, it catalyzes the oxidation reaction that causes the change in hair color.
Hair coloring of a less than permanent nature is generally used for entertainment because it can be shampooed out of the hair quite simply. Color rinses fall in this category and are used to give some tone to the hair. These products normally have only one component, the temporary hair coloring itself.
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