The purity is an issue.

来源: Morning3evening4 于 2012-09-21 09:26:54 [] [博客] [旧帖] [给我悄悄话] 本文已被阅读： 0 次 (258 bytes)
本文内容已被 [ Morning3evening4 ] 在 2012-09-21 17:17:59 编辑过。如有问题，请报告版主或论坛管理删除.

Gold itself is very stable in the air, or even in dampy air.I remember only a mixure of 3 strong acid can disolve gold. However, most of gold are not pure. That's why with time-goes, it loses its shinning.

Silver is much easily to be oxidated.

所有跟帖： 

• Agree silver. Most gold sold today are 99.99% pure. -天下多蚤- ♀ 给 天下多蚤 发送悄悄话 (0 bytes) () 09/21/2012 postreply 09:28:09

• I saw 98% golden bricks, hehe. Not shining at all. -Morning3evening4- ♂ 给 Morning3evening4 发送悄悄话 Morning3evening4 的博客首页 (0 bytes) () 09/21/2012 postreply 09:29:11

• Those are fake, filled with tungsten. LOL -天下多蚤- ♀ 给 天下多蚤 发送悄悄话 (0 bytes) () 09/21/2012 postreply 09:32:44

• 老地主解放前存下来的。那时估计技术上也没到99。99%的地步。 -Morning3evening4- ♂ 给 Morning3evening4 发送悄悄话 Morning3evening4 的博客首页 (0 bytes) () 09/21/2012 postreply 09:34:14

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