  Machined part, 99.999%.
This lovely if perplexing shape of "five nines" titanium was kindly donated by Ivan Petrov, of the Materials Research Laboratory at the University of Illinois. I had gone there to have my artificial knee joint sample tested to see what it was. It turned out to be Aluminum instead of the hoped for titanium. I guess he took pity on me by donating a couple of nice pure metals.
Source: Ivan Petrov
Contributor: Ivan Petrov
Acquired: 6 June, 2002
Price: Donated
Size: 3"
Purity: 99.999%
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