LateralRiddle #1272
Zoe spent ten minutes writing a long note with a cotton swab, but when she handed it to her friend, the paper looked completely blank. Her friend read every word anyway. How?
Hint: Think about the kitchen and a little heat.
Answer
Zoe wrote in lemon juice, and her friend warmed the paper
Lemon juice dries invisible, but gentle heat, like a warm lightbulb, turns it brown so the hidden message shows up.
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