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3D3D8" gold-plated wafer.
Pure gold plated silicon water. Not sure why, but if I had to guess I'd say it has something to do with reflecting infrared light.
Source: eBay seller a1-89
Contributor: Theodore Gray
Acquired: 2 February, 2008
Text Updated: 23 February, 2008
Price: $41
Size: 8"
Purity: >99.99999%
Silicon