Lemon juice works as invisible ink because it is mildly acidic and contains organic compounds that are sensitive to heat. When applied to paper, it dries clear and remains invisible. Upon heating, the acid in the lemon juice weakens the paper fibers, and the organic compounds undergo oxidation, turning brown. This process reveals the hidden message, showcasing a chemical reaction driven by heat and oxidation.
Lemon Juice: The DIY Invisible Ink That Actually Works
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