What is the primary characteristic of temporary hair color?

The primary characteristic of temporary hair color is that it provides a coating of color on the hair strand. Temporary hair colors work by layering color onto the outermost part of the hair without penetrating the hair shaft, which allows for easy application and removal. This type of hair color typically lasts for a few shampoos and is ideal for those who want to experiment with color without making a long-term commitment. The formulation is designed to adhere to the hair surface, which is what gives it its temporary trait.

In contrast, long-lasting effects, penetration into the hair shaft, and the need for a developer are features associated with more permanent or semi-permanent color products, which are not characteristic of temporary dyes.