15 April, 2004 (2)

15 April, 2004

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Text and images Copyright (c) 2010 by Theodore W. Gray.

Boron

Boron Boron Nitride ceramic disk

Boron Nitride ceramic disk.
Source: John Wechselberger
Contributor: John Wechselberger
Acquired: 15 April, 2004
Price: Donated
Size: 4.5"
Purity: <50%

Carbon

Carbon Hand-made pencils

Hand-made pencils.
Source: Theodore Gray
Contributor: Theodore Gray
Acquired: 15 April, 2004
Price: Donated
Size: 7"
Purity: >95%