Booster series is a shade-deepener designed for use with polyester, cellulose, wool, or their blends, dyed with black or other deep shades. It delivers a superior jet-black effect, enhancing the color by up to 60%, and produces an elegant tone with a well-balanced shade. This product is highly convenient, offering a simple one-step finish process. It also provides an excellent soft hand, eliminating the need for additional softeners.