E-Pik 219 was created for the preparation for copper for use with EPi's E-Brite 50/50 non-cyanide silver electroplating process. Does not produce undesirable fumes so no venting is required when using at room temperature. Produces a defined etch profile and consistent surface area. Concentration: 8–24 oz/gal. (Optimum 16 oz). Temperature: 65–90° F. Time: 2–5 minutes immersion.