glow visibly. Heat Colors for Blacksmiths shows images of mild steel at various temperatures.
At a given temperature, a blackbody will emit more light than any other surface. The table below shows the colors of a blackbody at exponentially decreasing absolute temperate. The left column of colors is how they would naturally appear. The top color is a sky blue, which has a color temperature of approximately 10000 K.
In the right column, each temperature's chromaticity is scaled proportionally to its Celsius temperature.
Read more at http://people.csail.mit.edu/jaffer/Color/Heat.
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