Here's an Easy Trick to Make Glass Totally Invisible

By Jesus Diaz on at

Even when you are only seeing one test tube disappear into this beaker, there are another two more inside. In fact, there's also a beaker hidden inside, completely invisible to the eye. How is this sorcery possible? SCIENCE.

It's a clever trick to try at home for those of you who never took chemistry classes: Get a glass recipient, fill it with glycerol or vegetable oil instead of water, and put a piece of solid glass or another recipient full of glycerol inside. It will disappear instantly, right before your eyes.

The explanation is simple: Glycerol has a refractive index very similar to glass. Light doesn't change its speed going from glass to glycerol, there's no refraction and the glass becomes "invisible."