For professional use only. Cohler's new Superblack rhodium plating solution is a black rhodium plating solution that produces a darker oxidized grey-black plate on gold and other precious metals than ever before. Use it for a durable tarnish resistant dark finish for all your plating needs. Superblack has a deeper dark finish than the original Cohler black rhodium bath. It works better for matching dark stones or where you just want a darker black plating on your jewelry. Great for two-tone plating and touch up repairs. Plates at room temperature using a platinized titanium anode.