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To make an invisible ink, one can use any acidic juice such as lemon, orange, or apple. This can be used to fill in a pen and carry it everywhere and anywhere. The invisible ink can be used to write on any paper. When paper is placed under candlelight, the secret message will be revealed.

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10y ago
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16y ago

Use lemon juice concentrate.

The writing dries invisible and heating the paper will make it turn brown and legible.

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Q: How do you make invinisble ink?
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