Manic Panic lasts differently from person to person and from color to color. Lighter colors fade quickly, while darker colors last longer. As long as the dyed hair is well-maintained, the Manic Panic lasts four to six weeks. It should be applied and left on for at least an hour.
Traditional color-safe shampoos should not be used with Manic Panic, because it prevents the hair dye from processing properly. Manic Panic is a vegan semi-permanent hair dye. This means it does not contain any harmful ingredients that damage hair, such as animal byproducts. Dawn dish soap gradually fades the hair dye.