I first burned a piece of paper and then heated the remaining ash with a windproof lighter until a very bright white light suddenly appeared at the heated spot. Why is this?
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Ash can hardly dissipate heat in this thin “paper-shaped layer”, so you can heat a small spot almost to the temperature of the flame. And the hotter a body is, the stronger or brighter it glows. You’re almost here with white glut.
It could be almost as limelight or Drummond light the name. At temperatures, the calcium carbonate, from which the ash consists of almost 50%, decomposes to calcium oxide and glows, just as in limelight. Only your flame is not as hot as a bang gas flame, so it is not as bright. Techtastic (Youtube) made a video about it.
This is due to the high temperature.