Cohler Superblack Pen Pals Black Rhodium Plating Solution .25 Gram Rhodium Container Volume 1 oz. .25 Grams of Rhodium Product Features: Durable, shiny black finish Tarnish-resistant finish Great throwing power and coverage Used to highlight black or brown diamonds Plates at room temperature Consistent plating results Plates uniformly – start to finish Ideal for two-tone jewelry, matching dark stones and plating dark black jewelry