An easily available substance which shows this effect is sugar.
Grinding sugar or rubbing two pieces of lump sugar on each other when it is dark, one can see the glow, if the eyes are well adapted to darkness (it must be pitch-dark).
However, the glow appears white, as colour vision needs higher intensities.
www.itp.uni-hannover.deEine leicht verfügbare Substanz, die Tribolumineszenz zeigt, ist Zucker.
Reibt man bei Dunkelheit zwei Stücke Würfelzucker aneinander, so kann man das Leuchten beobachten, wenn die Augen gut an die Dunkelheit gewöhnt sind (es muss stockfinster sein).
Allerdings nimmt man keine Farbe wahr, das Leuchten erscheint weiß.
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