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银元变黄是怎么回事
更新时间: 2020-11-17 00:00:00  

银元变黄的原因是银是不稳定元素,容易跟硫发生化学作用,人体汗液中含有很多硫,跟银饰接触,就会发生化学反应,银表面产生了硫化银,白银表面颜色便逐步由白色变黄变灰最后变黑。

硫化银是灰黑色粉末。密度6.85-7.23。熔点825℃。在沸点分解。不溶于水,溶于浓硫酸和硝酸,并溶于氰化钾和氰化钠溶液。用于黑金镶嵌术和制陶瓷等。将硫化钠与硝酸银溶液混合过滤而制得。

关键词: 银元 怎么 回事

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