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<p>[QUOTE=&quot;rlm&#039;s cents, post: 2235364, member: 7957&quot;]Anhydrous Au2O3 can be prepared by heating amorphous hydrated gold(III) oxide with <a href="https://en.m.wikipedia.org/wiki/Perchloric_acid" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.m.wikipedia.org/wiki/Perchloric_acid" rel="nofollow">perchloric acid</a> and an <a href="https://en.m.wikipedia.org/wiki/Alkali_metal" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.m.wikipedia.org/wiki/Alkali_metal" rel="nofollow">alkali metal</a> <a href="https://en.m.wikipedia.org/wiki/Perchlorate" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.m.wikipedia.org/wiki/Perchlorate" rel="nofollow">perchlorate</a> in a sealed <a href="https://en.m.wikipedia.org/wiki/Quartz" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.m.wikipedia.org/wiki/Quartz" rel="nofollow">quartz</a> tube at a temperature of around 250 °C and a pressure of around 30 MPa.<a href="https://en.m.wikipedia.org/wiki/Gold%28III%29_oxide#cite_note-3" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.m.wikipedia.org/wiki/Gold%28III%29_oxide#cite_note-3" rel="nofollow">[3]</a></p><p>Because we don&#039;t normally store our coins at 250°C at 30 MPa.&nbsp; Gold has existed for millions of years inside mountains through every weather, laying at the bottom of oceans in salt water, survived volcanoes, etc. and it still looks like (most of it anyway) gold when found in nature.[/QUOTE]</p><p><br /></p>

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