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Brain Teasers and Logic Puzzles

How do you make invisible ink show up?


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July 28, 2009 8:40AM

It depends on the type of ink used; there are several methods of using invisible ink and of finding them. The most common is to use a weakly acidic solution such as lemon juice; wipe this over the area thought to be hiding the ink and then heat it using a blowdryer, electric iron or oven on low heat. Another is to place the area under a UV light, as some inks will only show up under one.