Redken CHROMATICS # 6.01 natural hairdressing products. Ammonia-free permanent color is here, strengthening your hair up to two times more. Change your look as many times as you like without going through the fear that your hair will become fragile and brittle. This new color comes on strong with a wide variety of shades and with a new formula that fortifies the hair from within, leaving an intense and bright color as a result. This product must be used with the activating lotion.