What is the difference between semi-permanent and permanent hair color?

The correct answer highlights that semi-permanent color typically lasts about 4-6 weeks and does not penetrate the hair shaft as deeply as permanent color. This distinction is crucial for understanding how these products function and their suitability for different hair coloring objectives.

Semi-permanent hair color is designed to coat the hair without altering its internal structure. It allows for a temporary change in color without the long-lasting effects associated with more intrusive chemical processes. This type of color fades gradually over several weeks as the hair is washed and styled, making it an excellent option for clients looking to experiment with color without a long-term commitment.

In contrast, permanent hair color contains more robust chemical compounds that can penetrate the hair cuticle and alter the natural pigment, resulting in long-lasting color that does not wash out over time. Therefore, understanding the permanence and depth of penetration of these coloring agents is vital for making the right choice based on a client's desired outcome.

The other choices do not accurately represent the characteristics of semi-permanent and permanent hair colors, contributing to confusion about their effects and performances.