Cohler Superbrite Rhodium "White Gold" Bath Plating SolutionPre Mixed Rhodium Baths. Everything you need is already mixed into each bottle so this solution is ready to use as is. Just pour the rhodium into a beaker or tank and you are ready to start plating. SUPERBRITE produces a brilliant bright white finish at room temperature with a variety of plating ranges without burning the pieces or dulling the brightness. Both pen and bath solutions are equally bright, and when plated together on a piece of jewelry,