Which colours coat only the surface of the cuticle and do not enter the cortex?

Temporary colors are designed to coat only the surface of the hair cuticle, providing a quick and easy way to change hair color without affecting the underlying cortex. These colors typically do not penetrate the hair shaft, which means they are less damaging and will gradually wash out over time, usually after several shampoos. This characteristic makes temporary colors ideal for users looking to experiment with color without long-term commitment or for special occasions.

In contrast, permanent colors penetrate deeper into the hair structure, specifically into the cortex, allowing for longer-lasting results. Semi-permanent and demi-permanent colors also involve some level of penetration into the hair, but typically not as deep as permanent dyes; however, they still interact more with the hair than temporary colors do. Therefore, only temporary colors verify the property of solely coating the cuticle without entering the cortex.