Grounding of working platform , searing - iron , lead - cutting machine , stannum oven or auto refluence soldering equipment , must be led into earth at least 1 meter deep by thick iron cord , and fasten a big iron dollop at the end of iron cord 当用化学品清洗胶体时必须特别小心，因为有些化学品对胶体表面有损伤并引起褪色如三氯乙烯丙酮等。可用乙醇擦拭浸渍，时间在常温下不超过3分钟。
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