catchylife

Have you ever wondered what makes certain things glow under black lights?
For this experiment you will need:
• a black light • petroleum jelly• a piece of paper

1. First we’ll use the petroleum jelly as a kind of invisible ink. Dip your finger into the jelly, then use your finger to write a message on the piece of paper. Use more jelly if you need to – but this probably isn’t the time to write a long speech! When you’re finished, wipe any remaining jelly off your finger. Turn off the room lights and turn on the black light and check out the glowing light/message