Why not some random colour like purple or cyan?
In: Chemistry
When things get hot they glow, and the colour they glow depends on the temperature.
Regular warm things only glow in infra-red so you need a special camera to see it. The soot particles (wax that didn’t burn all the way) in a candle flame glow yellow, like the sun.
Candles aren’t that efficient, so they have a lot of soot in to give the yellow colour. A gas burner, for example, has a better oxygen supply and cleaner fuel, so burns with very little soot and can be almost invisible.
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