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06-09-2008, 06:45 PM   #16
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Join Date: Apr 2007
Location: Austin Texas
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Posts: 728
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Hmmm...heat, not light?

QuoteOriginally posted by KungPOW Quote
mmmmm.....Thorium....

Here is a link that explains the whole clear to yellow to clear again thing fairly well.

Activation of color centers in Glass

Who needs a science dregree now that we have google?
KungPOW, if I read your reference correctly, it's the HEAT, not light that has the clearing effect on the glass. Is that what you see?

Oh, well, I'll still have the tomatoes.

germar

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