Hair dyeing is the procedure to change the hair color. Among the usual reasons for wanting to change color are covering gray hair or gray hair, changing to a color that is considered more fashionable or desirable, and restoring the original hair color after having been bleached by hairdressing or discoloration processes. induced by the action of solar rays.
Hair dye, or hair dye, is a chemical preparation that is used to change the color of a person’s hair. Hair dye is used to cover gray hair since gray hair is a sign of advanced age. Young people can dye their hair as a way to go fashion or simply because they want to do it to change their appearance.
It is known that the Romans were interested in altering the hair color and from the available historical information it is known that they had created about a hundred recipes that used natural ingredients. These preparations only allowed to darken the hair. During the Renaissance, the blonde was a popular choice because he was considered angelic and attractive.
In 1907, Eugene Schueller, the founder of the company L’Oreal, created the first synthetic dye for hair, but did not have much sales success
Types of hair dyeing
The four most common types of hair dyeing are “temporary”, “semi-permanent”, “demi-permanent” and “permanent”.
Temporary hair coloring
Temporary hair coloring can be obtained by various techniques and methods that include rinses, shampoos, gels, sprays and foams. Temporary hair color is usually brighter and more vibrant than permanent or semi-permanent hair colorations. It is usually used to color the hair for special occasions such as costume or Halloween dances.
The pigment molecules in the temporary tinctures are large and do not penetrate the hair cuticle layer. The colored particles remain absorbed (adhered) to the hair and are easily extracted by a single wash. Typically it lasts between a few hours to a day.
Temporary hair dyeing can be maintained on hairs that are excessively dry or that are damaged in such a way that the pigment can penetrate into the hair.
Semi-permanent hair coloring
The dyeing for semi-permanent hair dyeing has molecules of smaller size than the temporary dye, and therefore manages to penetrate partially the body of the hair. Therefore, the color supports several washes, typically 4 to 5 shampoos or a few weeks. Some semi-permanent dyes may contain very low amounts of developer, peroxide or ammonia, and therefore are safer for damaged or brittle hair. However, semi-permanent dyes may contain certain toxic compounds such as the p-phenylenediamine compound or other similar ingredients.
The final color of each strand of hair will depend on its original color and porosity, so there will be faint variations of color in different areas of the head. This gives a more natural appearance than a homogeneous color typical of a permanent color. However, it also means that white or gray hair will not be dyed with the same tone as the rest of the hair. If there are only a few gray or white hairs, the effect will be enough to mimic them, but if the proportion of gray hair is considerable, there comes a point from which they can not be camouflaged.
In these circumstances, it is possible to delay the need to resort to permanent dyes if semi-permanent colors are used as a base and reflections are added.
The semi-permanent color does not allow to lighten the hair.
Demi-permanent hair coloring
The dye for demi-permanent hair dyeing is a permanent hair dye that contains an alkaline agent that is not ammonia (for example ethanolamine, or sodium carbonate) and, although it is always used with a developer liquid, the concentration of peroxide of hydrogen in that developer may be less than that used with permanent dyes.
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