I am looking for a liquid that illuminates when vibrations are added.

It does not have to be strictly chemical, it might as well be something else as well.

Maybe a crystal in powder form mixed with some kind of oil, or even algae in a thick:ish liquid.

Does such a liquid exist?

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    $\begingroup$ If you want a pure liquid to emit light, you'll probably have to vibrate it at very high frequencies with ultrasound, creating sonoluminescence, which AFAIK is not entirely understood yet but does not seem to be a chemical phenomenon. Perhaps a more exotic possibility would be a piezophototronic solid. $\endgroup$ – Nicolau Saker Neto Apr 15 '15 at 22:50
  • $\begingroup$ @NicolauSakerNeto interesting. At what frequencies are we talking here? $\endgroup$ – vaid Apr 15 '15 at 22:54
  • $\begingroup$ Well by definition ultrasound means 20 kHz and above. It seems that the exact value used can fluctuate between 20 kHz and 60 kHz (simply because lower frequency ultrasound is easier to produce, I assume), varying with parameters such as the nature of the liquid under sonication and the resonant frequency of the container. I don't really know much about sonoluminescence, but there's a lot you can find on it, if you're curious. The light is incredibly weak and brief, though, so don't expect much. $\endgroup$ – Nicolau Saker Neto Apr 15 '15 at 23:06
  • $\begingroup$ @NicolauSakerNeto would a more viscous fluid give off more light? I'm thinking that the resistance of the molecules would increase the sonoluminescence effect. $\endgroup$ – vaid Apr 15 '15 at 23:13
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    $\begingroup$ Dioxetanes emit light when energy (heat) is applied. I also think that @NicolauSakerNeto 's comment is right on target. Sonication (a way of supplying energy) can cause cavitation (bubble formation and collapse) in many liquids. Upon bubble collapse, light can be released. $\endgroup$ – ron Apr 16 '15 at 0:04

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