Hair coloring
Application techniques
Root touch-up, where color is applied only to the most recent section of re-growth (usually the first inch of hair nearest the scalp) Root touch-ups are repeated every 4–6 weeks as the natural color grows in and becomes apparent. People who color their hair to disguise gray often have these root touch-ups. All-over color, where the person wants all of their hair to be a different solid color Block coloring, where the person wants two or more colors applied to their hair, resulting in dimension and contrast All coloring techniques can be used with any type of color. For lightening, the hair sometimes has to be bleached before coloring.
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