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If it's red from black-body radiation, you should be more than fine with regards to contaminants.
You should be more concerned with nutrition. Or the current complete lack thereof. After all, anything healthy has by that point gone up in smoke.
Not to forget that if it's glowing red, it may be hot enough to set your head on fire the instant you stick it in your mouth. So do not eat anything that's glowing red from black-body radiation
So glad to see tips like "hey everyone you should actually not eat glowing embers"
Stickers like "Do not attempt to dry your cat in the microwave oven" are there for a reason.
Glowing blue or white is still safe though, right?
If the item shows any black-body radiation in the wavelength range of visible light, i.e. it can be seen with the Mk. 1 Eyeball, it's absolutely too hot too touch, let alone eat.