- Microwave 1 cup of tonic water for 45 seconds or until boiling.
- Stir the boiling tonic water into the Jell-O mix until it is completely dissolved.
- Stir in 1 cup of cold tonic water
- Refrigerate your Jell-O for four hours or until firm
- Place your Jell-O in a dark room and shine your black light on it.