Alter Ego Italy Spherique Ritual 2 Bio-Restructuring Serum 1000ml 33.8 oz Kertin Fluid, special molecular composition instantly penetrates within the hair shaft to repair even the most damaged structures, by transferning the balanced mix of reinforcing and rebuilding molecules. Its extremely acid pH captures the strengthening substances within the cuticle, without any dispersion. Use: after shampooing apply 15-20 ml of the product to towel dried hair, along the lengths and tips. Massage and leave on for 5 minutes, rinse off.