  Etched cast aluminum bar.
This bar was cast from very high purity aluminum pellets in a mold made by drilling a hole in a graphite slab, then etched with diluted potassium hydroxide. It was cooled slowly to allow crystals inside to grow large, as you can see from the size of the textured patches: Each patch represents a boundary of a single crystal.
Source: Juan Jimenez
Contributor: Juan Jimenez
Acquired: 2 December, 2007
Text Updated: 8 December, 2007
Price: Donated
Size: 2.5"
Purity: 99.9999%
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