Much like its close cousin, semipermanent hair color, demipermanent color creates a more natural looking effect without lifting any levels or tones out of the hair. However, a demi will last much longer, usually between 20 to 28 shampoos. And because this type of hair color gently fades out with each washing, there are no noticeable roots.
Demipermanent color is considered gentle and ammonia-free, using a low level of peroxide to penetrate the hair shaft. This means the chemicals work to deposit color, providing intensified, deepening results. Plus, they're much better at covering grays than a semipermanent, although not as effective as permanents. (More on those later.)
Two more great things about demipermanents? They're often used as fillers to replace missing tones from the hair before a permanent color is applied, and they're also used to tone highlights after the lightening process. Try L'Oreal Color Spa Moisturizing Colorant ($6.50) or L'Oreal Color Gems Haircolor Natural ($6) with L'Oreal Color Gems Creme Activator ($3.40) if you'd like to enhance your own natural tones.