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3D3DRhenium foil.
These are tiny little strips of rhenium foil about half an inch long. If they were made of aluminum this would be a pile of fluffy shreds. But it's rhenium, one of the hardest and densest elements, so instead it's a surprisingly heavy mass of fairly stiff strips.
Source: eBay seller forsythia
Contributor: Theodore Gray
Acquired: 29 September, 2003
Price: $16
Size: 0.5"
Purity: 99.9%
Rhenium