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Jack Cole wrote: Jed, I don't think this is correct (about it needing to be white hot). When I examine the colors, they almost border on being too hot. White hot puts you up in the 6000+C range according to Wikipedia. Or am I misunderstanding something? *********** I am used to looking inside glass melting furnaces running 1400 to nearly 1600C. Your require a tinted glass to do so. 1400C is indeed white hot but not a blindingly so a say 1550C
