Redken Double Fusion is ONE of the permanent hair color lines by REDKEN. It needs to be mixed in 1:1 ratio with most commonly a 20 volume developer. Once applied to the hair, there is a processing time. This product should not be left in longer than suggested time. This is not just any hair cream. This product may cause blindness and is suggested use only by a trained professional. This product needs to be rinsed out of the hair and kept off skin. Salon Centric carries this product, licensed professionals only. It can be found in salons dispensaries away from the general public. It may be purchased online, please follow all manufacturers directions.