33 AMAZING SCIENCE EXPERIMENTS!

The disappearing ink experiment This is a fun and easy experiment that shows how invisible ink works. You will need a lemon, a cotton swab, and a piece of paper. Dip the cotton swab in the lemon juice and write a message on the paper. The message will be invisible at first, but when you hold the paper up to a heat source, the lemon juice will react and the message will appear.