According to the haircare brand Clairol Professional, the major difference between semi and demi permanent hair color lies in the permanency: While demi permanent hair color can last up to 24 shampoos, semi permanent hair color typically lasts from four to 12 washes.
"Unlike demi permanent hair color, semi permanent hair color is a deposit-only formula and won't require a developer or any level of peroxide," Dove hairstylist Cynthia Alvarez tells Byrdie. "The color coats the outside of the hair and changes the tone rather than the color... Semi-permanent color is also commonly referred to as a stain, gloss, or a toner."
On the other hand, demi permanent hair color contains a developer — or a small amount of peroxide — that allows it to penetrate the outer cuticle of your hair, thus making the color last longer (via L'Oreal).
So which kind of dye is best for what you want? As eSalon.com explains, a demi permanent hair color is an ideal option for anyone who wants a temporary color change without the damage or commitment of a permanent hair dye. While a semi permanent hair color is great for those who want an even more temporary hair color change (and maybe want to experiment with a bold shade!), given its quick fade.
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