Clairol Soy 4Plex Premium Creme Demi Permanent Hair Color. Our demi-permanente formula delivers color so luminous it reflects. Exclusive SOY4PLEX formula boosts shine up to 65%,* and nourishes and smoothes hair. Our creme demi-permanente hair color is deposit-only and can be used to enhance, deepen or refresh color to eliminate dullness. The no-ammonia formula is gentle enough to be used immediately after relaxing hair. Best for bowl-and-brush application.