Gray Oxidizing Drops, G.O.D, covers resistant gray completely. G.O.D. can be used with any manufacturer’s permanent, demi & semi-permanent hair color; do not use with color stains or temporary colors. As with all Dennis Bernard products, G.O.D is color friendly and can be used with all other POWERTOOL color additives, making our Gray Oxidizing Drops one of best anti gray hair treatment on the market.