What Does Demi Permanent Hair Dye Mean. Unlike longer lasting versions it has no ammonia and a very low peroxide content. It has an alkali in it to open the outer layer of the hair and raise the cuticle.
Non oxidative dye is deposit only. The term refers to semi permanent and temporary dyes. Semi permanent hair color is good for first time dyers or those who aren t looking to make a drastic change.
According to zoë carpenter for joico a crème demi permanent hair color is an alkaline ammonia free product that comes in a variety of shades and has the ability to either cover gray hair or blend hair color in a safe and natural manner.
Demi permanent hair color is ammonia free so its molecules get under the outer cuticle of the hair shaft but unlike permanent dye doesn t penetrate the strand. It also has a small amount of peroxide that affects your color slightly. Unlike longer lasting versions it has no ammonia and a very low peroxide content. The color molecules are not as large as well so they wash out in about 24 shampoos.