What is the difference between permanent and temporary hair color?

Permanent hair color is formulated to penetrate the hair shaft and chemically alter the hair structure, providing a long-lasting change in color. This process often involves an oxidizing agent, such as hydrogen peroxide, which enables the dye to enter the hair's cortex, resulting in more durable coloration that can withstand washing and fading over time.

In contrast, temporary hair color typically adheres to the outer layer of the hair without altering its chemical structure. This means that while temporary colors can provide vibrant results and allow for versatile changes in appearance, they are not designed to last extensively and will wash out after several shampoos. This distinction is crucial for anyone working in the beauty industry, as it influences the choice of products based on client needs, desired longevity of color, and hair condition.

The other choices do not accurately represent the differences between permanent and temporary hair color, particularly in terms of how each type affects the hair's structure and longevity.