Cool Define Demi Permanent Hair Color Ideas. The reason why we color our hair is as different. The longevity of hair dye is affected by how deeply the color penetrates the cuticle of the hair.

The reason why we color our hair is as different. These come in the form of. Web permanent color opens the cuticle, the outside layer of the hair, and is pushed in with developer in order to penetrate into the cortex, the innermost layer of the.