  Gold leaf in oil. 
This little bottle was sold for a few dollars in the Chicago Field Museum's gift shop, advertised as real gold.  This might seem far fetched, until you realize that it's gold leaf, which is incredibly thin: There is no more than a few milligrams of gold in here despite the full appearance. 
Source: Nick Mann 
Contributor: Nick Mann 
Acquired: 10 March, 2007 
Text Updated: 12 March, 2007 
Price: Donated 
Size: 1" 
Purity: >99%
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