A link about lead into gold:
http://chemistry.about.com/cs/genera.../aa050601a.htm
Quote:
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Originally Posted by The key point
Transmutation of lead into gold isn't just theoretically possible - it has been achieved! There are reports that Glenn Seaborg, 1951 Nobel Laureate in Chemistry, succeeded in transmuting a minute quantity of lead (possibly en route from bismuth, in 1980) into gold.
There is an earlier report (1972) in which Soviet physicists at a nuclear research facility near Lake Baikal in Siberia accidentally discovered a reaction for turning lead into gold when they found the lead shielding of an experimental reactor had changed to gold.
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I remember hearing about the Seaborg one. Basically it can be done, but the cost of man made gold was astronomically higher than regular gold.