This is a pretty cool technique that definitely needs to come with a health and safety warning. So, don’t try this at home unless you understand how electricity works and how to experiment with it safely. If that’s you, then you’ll love this video from Hyperspace Pirate. Even if it’s not you, watch it anyway because it results in some pretty cool photography!
It’s a process called Kirlian Photography and it’s used to be able to photograph the phenomenon of electrical coronal discharge. It was accidentally discovered by Semyon Kirlian, after whom it was named, in 1939. It’s a similar principle as those “Plasma Globes” that were so popular in the 80s.