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Try fluorescent dye (non-toxic, please!). Highlighter ink can work for ordinary tap water (more detail here). Fluorescent paints and glowsticks can also produce decent amounts of light; however, all three of the above methods do not produce substances that are safe to drink. Always be careful when using dyes and other chemicals in beverages. Putting rum on ...


Tonic water fluoresces - if you shine UV (black light) on it, it will glow. From the above link:


Yes, it is (probably) caused by supercooling. You might be interested to have a look at this Google search to see lots of similar examples. From this search I found this article that gives a nice description - see the section titled Solidification. The figure they show is: which is obviously similar to your cooling curve. What happens is that the liquid ...

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