this post was submitted on 27 May 2026
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hmmm
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For things that are "hmmm".
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My understanding is that it doesn't really depend on the metal much. It's just the blackbody radiation associated with that temperature. So basically anything glowing red from heat is probably over 500°C.
"As the object increases in temperature to about 500 °C (773 K; 932 °F), the emission spectrum gets stronger and extends into the human visual range, and the object appears dull red."
https://en.wikipedia.org/wiki/Black-body_radiation