Our boys love anything that glows in the dark. When we found out that anything made with tonic water will glow in the dark (with a blacklight), we thought we would give it a try.
We made red and green jelly and found that the red jelly didn’t work but the green jelly was great. I made the jelly by mixing the jelly mix with 1 cup of boiling water until it was all dissolved and then mixed in 1 cup of cold tonic water. Pour into containers and set in the fridge.
You can also make glow in the dark jelly shapes by pouring the jelly into a baking tray. When s set, cut out shapes with a cookie cutter. To get the shapes out of the baking tray, rest the bottom of the pan in some warm water to loosen the gelatine.
Our boys did have a taste test, but the tonic water is a bit too bitter for them.
Why does it glow?
Tonic water contains an ingredient called quinine and under a black light, quinine absorbs the UV light which is invisible to our eyes. The black light energises the quinine’s electrons who then give off their extra energy as blue light.