This is the explanation for the famous card trick Oil and Water, where black and red cards get mixed together but kept separated magically like oil and water.
The effect: The magician pulls out a blank piece of paper from his wallet claiming that it's real money. When the spectators express their disbelief, the magician visually changes the blank piece of paper into a real dollar bill!
You just need: regular white sheet of paper, a dollar bill, scissors, and adhesive: scotch double side tape.
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