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5min $5 invisible ink utilizing the already-there heat sensitive chemical on thermal paper. I think this works much better than lemon juice because lemon requires you to half ...
you need, 1.thermal paper 2.water and a cup 3.tooth picks/q-tips (to write with) 4.candle or other heat source NOTE: If you dont have blank thermal paper just use ...
fully soak in water
remove as much water as possible. If you have a tea bag strainer/smusher thiny it would work well.
keep wetting and wringing out the paper untill your ink looks like whats in the pic below. the more concentrated your ink the better it will work.
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