采用化学腐蚀法，通过控制有机酸腐蚀后焊料烘干的氧分压和温度控制焊料表面氧化层厚度。
Chemical removal approach is utilized and the oxide thickness is controlled by controlling the oxygen pressure and temperature during solder drying after organic acid removal.
迎宾牌是一块经化学酸腐蚀的铜板，上面刻有各种禁忌标志。
WELCOME PANEL is a bronze panel of banning signs that the artist engraved.
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