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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.
Demi Permanent Vs. Semi Permanent Hair Color. Both demi-permanent and semi-permanent hair color dyes can be applied at a salon or at home. The main differences between demi and semi-permanent hair color are the duration the color lasts and how the dye penetrates the hair shaft. Semi-permanent hair color does not contain any peroxide while demi-permanent hair color may contain low levels of ammonia or peroxide.