All of the following are characteristics of temporary hair color EXCEPT?

Temporary hair color is designed to provide a quick and easily reversible option for changing hair color. A key characteristic of temporary hair color is that it does not create a lasting change to the hair shaft itself. It can be applied and washed out without causing damage or altering the hair's structure. This type of color typically attaches to the outer layer of the hair and can be easily removed with a regular shampooing routine.

The duration that temporary hair color lasts is generally much shorter than several weeks; it is often meant to last for just a few shampoos. This makes the option of lasting for several weeks inaccurate for temporary hair color, as its main advantage is the ease of change without a long-term commitment. Thus, the correct characteristic that differentiates temporary hair color from other types of hair coloring products is its brief duration, reinforcing its purpose for those seeking a temporary or experimental color change.