Make This Crazy Cool Invisible Ink Marker Using Just 3 Ingredients

Most likely how the Founding Fathers did it in National Treasure's version of history.
Most likely how the Founding Fathers did it in National Treasure's version of history.

Make This Crazy Cool Invisible Ink Marker Using Just 3 Ingredients

How to Make Invisible Ink · George Washington's Mount Vernon

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SCStyle Invisible Ink Pen 28Pcs with UV Light Magic

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1 tablespoon borax 1 teaspoon water 3 tablespoons glue

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DIY Invisible Ink Invisible ink, Secret ink, Ink