Final answer:
Semi-permanent, demipermanent, and permanent hair color products are used on pre-lightened hair to achieve pale and delicate colors. Semi-permanent color washes out over time, while permanent color chemically alters the hair's structure. Hair coloring can be done by professionals or independently at home.
Step-by-step explanation:
Semipermanent, demipermanent, and permanent hair color products are used primarily on pre-lightened hair to achieve pale and delicate colors. Semi-permanent hair color washes out over time, typically in four to six weeks, making root regrowth less noticeable. It is a temporary coloring option that does not lighten hair.
On the other hand, permanent hair color chemically alters the hair's structure, replacing the natural color with synthetic color that stays in the hair until it is cut away. It requires the use of 1,4-diaminobenzene or 2,5-diaminotoluene as the colorant, a coupling agent, and an oxidant. Permanent hair coloring should be done under basic conditions and involves oxidation of the colorant to the quinone state.
It is important to note that hair coloring can be done professionally by a hairdresser or independently at home. Depending on the individual's preference, they can choose between semi-permanent and permanent hair color to achieve the desired effect.