Have you ever used lemon juice as invisible ink? It isn’t
hard. Squeeze juice from a lemon into a small bowl, add a few drops of water
and stir. Dip a Q-tip into the juice and use it like a pen to write a message
on clean, white paper. When the paper dries, the message should be invisible.
All you have to do is hold it near a warm light bulb for the “ink” to reappear.
In 1995, a man named McArthur Wheeler robbed two Pittsburgh banks in broad daylight,
without a mask. He even smiled at security cameras as he did. He was arrested
and charged later that same day. McArthur was dumbfounded when police showed
him video evidence of his crimes. “But I wore the juice,” he said. McArthur
believed rubbing lemon juice on his face would make him invisible, as long as
he stayed away from heat sources. A little knowledge is a dangerous thing.
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