From: Jan Norris (220.127.116.11)
In Reply to: semi/demi???? For pros posted by debbi on February 12, 2008 at 6:15 am:
Semi permanent hair color is a direct dye that does not require a developer. It is applied directly to the hair without adding a developer and will last approximately 4 shampoos. A demi permanent hair color requires a very mild developer and because it slightly swells the hair, it will last longer. Both semi permanent and demi permanent hair color are deposit only colors and will not lift your natural hair color. They will blend gray hair, but will not completely cover. A demi permanent hair color is an excellent choice for thermally straightend hair. I use it regularly to refresh permanently colored hair. It is very healthy hair color product.