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