You will need:
- Various food coloringsPlace the glasses in a row, and pour water into the 1st, 3rd, and 5th. In the 1st and 5th, add a few drops of red food coloring; in the 3rd add yellow; in the 5th, once again, add dark blue. Fold 4 paper towels 4 times, so that you end up with long strips, and then fold them in half. Place the ends in different glasses: one between the 1st and 2nd glass, another between the 2nd and 3rd glass, and so on. In a few hours, you’ll have a rainbow!
Watch the video here.