HCT-56 is an electroplating process for heavy white bronze, which can yield a silver-shining white deposit. Its composition is 55% copper, 45% tin and zinc. After plating with acid copper, it can replace bright nickel and produce a white deposit. It can also be suitable for under-plating prior to final plating, such as gold, silver, gun color and others, on the basic metal like copper, copper alloy, zinc die casting, and cast iron.