Note: Food colouring stains, so wear old clothes or an apron. Stains on your fingers will eventually come off.
How does it work?
This rainbow is all thanks to the science of density! Density is a measure of how densely packed molecules are within a liquid. The denser a liquid (for instance, honey), the more closely packed the molecules. Less dense liquids can float on top of more dense liquids because they’re lighter!