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Hair colors are all classified by the length of time they will last in your hair. Here they are in order of shortest-lasting color to longest.

1 Washable: These are temporary dyes and stains that wash off relatively easily with shampoo. They are also called “deposit only” colors. The benefit of this type of coloring is that it does not damage hair. The drawback is that the color does not look as good or last as long.

2 Semipermanent: If you are unsure about a new hair color, the semipermanent route may be the way to go. These products deposit color on and just below the surface of hair. They do not break down your natural color so they can only be used to make your hair darker. Demipermanent hair colors use the same basic technology but last a little longer. They look good and do not damage your hair as much as permanent colors, but they also don’t last as long.

3 Permanent: These colors completely change the hair and can make even the darkest brunette into a bleach-blond bombshell. They work in a multiple-step chemical process. First, the color that is already in the hair is chemically broken down with hydrogen peroxide. This step also has the effect of opening up the hair “pores” so the color molecules can get in. Next, color is applied and allowed to chemically react. As it reacts, the color molecules get too big and become locked inside the hair shaft. This is how the color becomes permanent. This method gives you the most natural, longest-lasting hair color possible. Unfortunately, it is also the most damaging to hair. There’s always a trade-off.

4 Highlights: Blond highlights are the result of bleaching hair in a controlled way. Aluminum foil is often used to keep the peroxide bleach away from hairs that are not to be colored. The process is permanent (until your hair grows out, of course) and highly damaging. But it does make your hair look great!