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Partially melted plug.
An example of the element Chromium

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Chromium Partially melted plug
Partially melted plug.
Description supplied by the source:
This is a formerly machined and threaded chromium plug of some sort. Its purity is 3N, so it was partially melted down in a vacuum arc furnace in order to use it as a custom alloy additive- you can see a little bit of copper from the crucible in which is was melted on the top flat face. What probably happened was that there wasn't perfect contact between the piece and the crucible, resulting in an arc which flash-vaporized a tiny amount of the copper crucible. As for its origin, the original melting company has no idea what it was used for originally and neither do I--massive chunks of pure chromium are pretty scant, the two main examples being electrolytically deposited anodes and sputter targets, of which this is neither.
Source: Ethan Currens
Contributor: Ethan Currens
Acquired: 30 April, 2008
Text Updated: 30 April, 2008
Price: Anonymous
Size: 1"
Purity: 99.9%
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