Final answer:
Traditional semi-permanent haircolor lasts around four to six weeks and fades gradually, providing a more natural and less maintenance-intensive option compared to permanent haircolor.
Step-by-step explanation:
Traditional semi-permanent haircolor typically lasts about four to six weeks. Semi-permanent hair color gently adds color to the hair, and because it does not fundamentally change the hair's natural pigments, it fades gradually with each shampoo. The final color is impacted by the hair's original color and porosity, resulting in natural-looking variations in shade. Semi-permanent dyes are unable to lighten hair, as lightening requires chemical lighteners, like bleach, which are permanent. Furthermore, when hair grows, the natural root color will show, and the dyed hair will be gradually cut away as hair grows and is replaced. Many people color their hair, with a significant number of women and men deciding to change their hair color from its natural state. While permanent haircolor changes the structure of the hair and requires root maintenance to accommodate new growth, semi-permanent color is a more temporary solution, allowing for less maintenance and a more gradual fade without a sharp contrast at the roots.