The purity is an issue.

來源: Morning3evening4 於 2012-09-21 09:26:54 [] [博客] [舊帖] [給我悄悄話] 閱讀數 : (258 bytes)
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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.

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

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

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

• 老地主解放前存下來的。那時估計技術上也沒到99。99%的地步。 -Morning3evening4- ♂ 給 Morning3evening4 發送悄悄話 Morning3evening4 的博客首頁 (0 bytes) () 09/21/2012 postreply 09:34:14

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