are semi permanent dyes damaging
Semi-permanent hair dyes are a significantly less harsh alternative to traditional dyes that wonât damage your hair. Instead of penetrating the core of the hair, semi-permanent coat the hair's surface and wash out over time.nlike permanent dyes, which contain harsh chemicals that can damage your hair and skin, there is usually no too long with semi-permanent colors. Some people even leave their dye in overnight for the longest lasting and brightest color possible.