Roots is the term used by hairdressers to describe the condition by applying artificial pigments to the hair, where the roots (the part of the hair follicle closest to the scalp) feel warmer in color (more red/orange) from the tip of the hair. This can happen for several reasons, but the two most likely causes are described below. It will be helpful to understand the general nature of lightening, or "lifting", natural hair color. Natural hair color is determined by the presence of melanin. Generally, the more melanin, the darker the hair. In order for hair color to be brighter, chemicals must penetrate the hair cuticle, insert the cortex and melanin. Permanent hair color, bleach and other dyes can do this in varying degrees. Permanent hair colors, unlike bleach and other decolorants, leave artificial pigments while destroying natural pigments. This pigment is a mixture of primary colors: blue, red and yellow. The chemical reactions occurring within the hair follicles during the lightening process, in essence, destroy the natural melanin as well as the colors blue, red and yellow, respectively, one at a time. The extent to which this occurs can be affected by the proportion of existing chemicals, especially hydrogen peroxide, as well as by the temperature at which the hair is stored during the process. Artificial hair pigments, unlike natural hair pigments, can not be lightened to some extent with other artificial hair color.
After the hair is lightened (natural color is destroyed) to an adequate level, the pigment in artificial color will, ideally, be in perfect blue-red-yellow balance, replacing the newly destroyed natural pigments. Often, hair that has been lightened will show more red or orange than before. This is because there are not enough blue pigments to visually balance the remaining red and yellow (both natural and artificial) pigmentation. Understandably, the hair color manufacturer chooses to make a mistake on the side of changing the hair a bit too red, in the absence of enough blue, than it may give the color of purple or blue hair, in the absence of sufficient yellow and/or red pigmentation (as is likely to occur when applied to gray or very light gray hair).
Video Hot roots
Cause
The first way that hot roots can occur involves two separate color applications. Once the hair color is permanently applied and the next hair growth occurs, the affected hair root can, and usually, show a distinctly different color from the tip. To equate the color of the roots and the edges, other artificial colors can be applied to this new growth. This is called "the touch of color." If the touch color is lighter and/or warmer than the original color used, the roots may appear warmer, creating a hot root. This will happen even if the touch color is applied from root to tip because, as mentioned above, newly applied artificial colors will not brighten any artificial color already on the end, just as natural colors do at the root.
Second, the hot roots can be the result of a single color process. If a darker color of natural hair color is being lightened with permanent hair color, the heat produced by the scalp can cause the closest hair to make it brighter and/or warmer than the ends of the hair.
Maps Hot roots
References
Source of the article : Wikipedia
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