How to use This product was developed for professional use only and should not, therefore, be used at home. Mix L’Oréal Professionnel Inoa Permanent Hair Dye with the suitable L’Oréal Professionnel Inoa ODS Oxydant Riche developer depending on the hair condition and preferred technique. Use a ratio of 1:1. Apply to the hair adjusting the technique to the desired results and access developing time accordingly. After developing, gently emulsify the product to remove the color from the scalp. Then rinse thoroughly until the water runs out clear and finish with the L’Oréal Professionnel Inoa Post Shampoo.