This man’s trick for robbing a bank will make you question reality

[post_page_title]Hidden in plain sight[/post_page_title]
While his plan didn’t actually make sense, a small part of it did hold true – it turns out that invisible ink does exist. If you use lemon juice – mixed with water – to write anything on a piece of paper, the writing will remain invisible until the paper is heated, in which case it will start showing up. The science behind it is quite simple: the juice is an organic substance that oxidizes and turns brown when heated. It’s not the only possible source for invisible ink, though, as orange juice, milk, onion juice, vinegar and even wine work just as well. Despite his confidence, Wheeler wasn’t about to leave anything to chance…