Quinine gives a distinctive bitter taste to tonic water and also fluoresces brightly under uv light.
Chlorophyll glows bright red under uv light and it’s easy to make an extract containing chlorophyll from green leafy vegetables like spinach.
By combining the two – tonic water jelly and spinach extract, we were able to make a spooky vampire glowing thing.
It’s good enough to eat.
2014 is the International Year of Crystallography.
Commercial tonic water typically contains about 67mg of quinine per litre. It may be possible to separate quinine from tonic water in the school laboratory and use this an International Year of Crystallography project.