Keratin Complex It's A Blonde Thing Lightening System Developer 20 Vol It’s a Blonde Thing Developer 20 volume/6% - Fortified with a triple-protein blend to leave the hair silky, shiny, smooth and healthy - Hydrolyzed keratin strengthens and restores damaged hair, creating a protective barrier on the hair shaft and filling in empty spaces inside the cuticle to protect the hair from breakage - Hydrolyzed silk improves elasticity and restores the hair's moisture balance - Collagen enhances softness and shine for lustrous, silky texture Directions: Mix one part (scoop) of it’s A Blonde Thing Keratin Lightening System to two parts (scoops) of It's a Blonde Thing Developer. Mix well. Use only with It’s A Blonde Thing Keratin lightening System