Step 3: Time to make some icing
A container of white or off white flavored icings
A bottle of Tonic Water
This is the simplest method.
Take your regular icing and add Tonic Water to the mix.
Stir it as evenly as possible.
This is when a black light comes in handy.Every once in a while as you stir (or maybe the whole time) turn the lights off and the black light on. Take a peak at your mix and see if its glowing.
Also, the tonic water makes the icing slightly bitter. Tonic water is non alcoholic but does have a taste that not everyone will like. So as you add the tonic water, taste a little bit of the icing to make sure it is not over powering the flavors.
The downfall with this method, is that when stiring the mix by hand, I couldn't get a very even glow. But it was still glowing and some spots when iced on the cupcake glowed stronger then others. This gave it an interesting effect in itself.