... marking machine: This products can be used at the same time in the circumstance of engraving black or white mark on ... machine: It can be plated gold, platinum, rhodium on various metals, for plating gold (24k gold, 18 k gold, and imitated gold), it not only for ... can be electroformed of nickel, copper, iron, chromium, tin, zinc, 24k gold, pure silver, etc. with a strong power, high speed, lower ...