... of electrotyping machine: It can be electroformed of nickel, copper, iron, chromium, tin, zinc, 24k gold, pure silver, etc. with a strong power ... .6. Work as one of metal colored machine: It can be colored the all metals with bright, gold, red, green, blue, yellow ... as one of electronic polishing machine: It can use one specific liquid, which process electrolyse with work piece in the anode position ...