Coloration and care 9R Fire Red from Les Trois Chenes is a formula for a permanent coloration rich in pure pigments, it covers 100% of gray hair from the first application and reveals the brilliance and shine of the hair, enriched with vegetable proteins Color & Soin perfectly colors the hair and makes it silky. He has been a pioneer of coloring with plant extracts in pharmacies for more than 20 years; Color & Soin is the permanent coloration that takes care of your hair, giving you a professional result. An exceptional, intense and reliable permanent color. Full coverage of gray hair. Optimum comfort for the scalp A preliminary test should always be carried out. To test, clean a small area of skin behind your ear or on the inside of your forearm with soap and water or alcohol. Apply a small amount of ready-to-use hair dye to this area and allow to dry. 48 hours later, gently wash the skin area with soap and water. If there does not appear to be any irritation, it is generally assumed that there is no hypersensitivity to the dye. However, the test must be repeated for each application.