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Pour lemon juice into a glass. Dip a cotton wool bud into it and use it to write your message on paper. You can re-dip the bud if it dries out.
Let your writing dry; it should become invisible. To make it visible, hold it to a strong light or iron it because lemon juice darkens when heated.
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Invisible ink was invented by Benjamin Franklin and is currently used in government documents as a secret code. Benjamin Franklin used lemon juice as the first invisible ink. The acid in the lemon juice weakens the paper where it has been spread. Therefore, if the paper is held over a candle or another heat source, the area where the lemon juice was spread will burn more easily. This will reveal the placement of the lemon juice.
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