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If a glass of certain colour is heated, then how can we determine the corresponding colour that it will glow with?

For eg: I saw a question that asked "A blue glass when heated will glow with which colour?" and the answer was stated as "yellow" because "Blue glass appears blue at ordinary temperature as it absorbs all other colours. When it is heated, it emits white radiation deficient of blue colour, i.e., yellow coloured radiation."

How was this obtained? How is white light deficient of blue light yellow? How can we predict the same for a different case?

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you consider it a black body radiator, and Know the max of the spectrum at different temperatures, for practical use people use a color scale with temperatures versus color and compare the color to what they see. so you can adjust for different material , but the difference is not large for example between glass and iron

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  • $\begingroup$ I'm sorry, but I don't really find this relevant with respect to my question, maybe because it is not worded very clearly. Could you explain with more elucidation? $\endgroup$ – pyridine Aug 14 '20 at 4:02
  • $\begingroup$ do you know what black body radiation is? $\endgroup$ – trula Aug 15 '20 at 17:14
  • $\begingroup$ Yes I do. Do you understand my question? $\endgroup$ – pyridine Aug 16 '20 at 5:41
  • $\begingroup$ I think I understood it, and my answer is: at high temperature the difference between glass and a black body ist very small. $\endgroup$ – trula Aug 16 '20 at 20:57

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