... ,electroform,metal color, metal plating,electrophoresis, polishing,Aluminum color Multi-functional High speed electronic engraving machine is one of used specific ... , iron, chromium, tin, zinc, 24k gold, pure silver, etc. with a strong power, high speed, lower stress, and top quality ... It can use one specific liquid, which process electrolyse with work piece in the anode position, and polishing of the ...