Invisible Ink

Every budding spy needs invisible ink, right? Although pink in the bottle, this invisible ink dries clear, but when held up to a gently heated source, like a light bulb, it becomes blue, but when the paper cools, it becomes invisible once again. Might also be perfect for those who write in journals and don't want just anybody to be able to read what s/he wrote. $16 at The Library Shop.









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