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Cerium oxide polishing disk.
An example of the element Cerium

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Cerium oxide polishing disk.
Cerium oxide is commonly used for polishing glass: This disk is impregnated with it.
Source: eBay seller eldoglassnmirror
Contributor: Theodore Gray
Acquired: 16 October, 2009
Text Updated: 18 October, 2009
Price: $14
Size: 3"
Purity: <30%
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