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How To do Invisible ink? Answered

I want to hide my notes,records on the paper.I don't want to use ink.I want to write with invisible ink.so I want to know how to do invisible ink?

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This has been answered before at this link

Lemon juice - develop via heat

OR

Wet the paper - put a dry sheet on top and writ on it.

When he under paper dries it will be plain. wetting it will reveal the writing.