What Does Semi Permanent Mean In Hair Dye. Demi permanent may contain some peroxide but it still won t lighten your hair. Opening up the hair shaft and adding color.
The formulation of permanent dyes is very complicated and manufacturers go to great lengths to attain long lasting color that does minimal damage to the strength and elasticity of your hair. Semi permanent hair dye is a type of dye used for hair color that starts to fade in about four to five weeks since the dye often only covers a small amount of the hair follicle most colorists do not recommend this for stubborn gray hairs this type of hair dye will not lighten hair but will change the hair a few shades or enhance the natural color. The dye coats the surface of the hair shaft rather than fundamentally changing the color of the hair.
Demi permanent may contain some peroxide but it still won t lighten your hair.
Permanent dyes have peroxide and or ammonia and actually enter the hair cortex creating an actual change. Here is a summary of semi permanent color. Semi permanent hair dye is meant for short term hair color changes. Permanent dyes don t have to be applied as often as semi permanent or temporary colors.