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Definition: Semi-permanent hair color is defined as color that is deposit only and typically lasts 4-6 weeks depending on the hair's porosity and condition. Semi-permanent hair color usually has low or no ammonia and is a great options for clients that are concerned with the damaging effects of peroxide. Semi-permanent color will not completely cover grey but it can be used for blending it. Shop â¾.
1 If the color you use is too ashy, say, your skin will look drab and old, says Saboski. 2  You also risk a scalp reaction if your skin doesn't tolerate the dye chemicals. 3  To do a patch test, apply the dye on a small section of your hair, and see if the color is too light, dark, or ashy. Demi-permanent color is a mixture of permanent and semi-permanent dyes. 2  It doesn't have the power to lighten dark hair, but it can match or deepen your color. 3  You can also try semi-permanent dye, which, as with demi-permanent color, won't lighten your hair.