15 April, 2004 (2)
15 April, 2004
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Text and images Copyright (c) 2010 by Theodore W. Gray.
Boron Nitride ceramic disk.
Source:
John Wechselberger
Contributor:
John Wechselberger
Acquired:
15 April, 2004
Price: Donated
Size: 4.5"
Purity: <50%
Hand-made pencils.
Source:
Theodore Gray
Contributor:
Theodore Gray
Acquired:
15 April, 2004
Price: Donated
Size: 7"
Purity: >95%