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3D3DBorosilicate glass Medallion.
I made this medallion for an article in my Popular Science column, using a charcoal grill to melt old borosilicate test tubes down and press them into a graphite mold.
Source: Theodore Gray
Contributor: Theodore Gray
Acquired: 26 October, 2008
Text Updated: 16 April, 2009
Price: $1
Size: 2.5"
Composition: SiO2+Na2[B4O5(OH)4]