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和硝酸銀接融过的东西,常变成灰黑色,不易洗掉,如用2.5％的碘酒擦过,再用酒精擦以脫去
Melted with silver nitrate things, often become gray-black, not easy to wash off, such as with 2.5% iodine rub, and then rub the alcohol off