... less than 1/10 price compare with the laser engraving product, besides, with clearly, enduring, no change color, ... , tin, zinc, 24k gold, pure silver, etc. with a strong power, high speed, lower stress, and top ... goods, forming of VCD mould, molding of laser false prevention label etc. 5. Work as ... use one specific liquid, which process electrolyse with work piece in the anode position, and polishing ...