![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiK2Qecf9x6fM3jKPdXoPpaLLZNPsJz6wzfyAw7g0H9ZtrRO0ogklgxUWCabR1t8gxefW7200uciKrx_RJFLBqkf7Kf9-NJU_35ufdQnYNGWvUyFjvYo9Ot4P-KfTG2jamHap2s/s320/invisibleink.jpg)
Although it looks pink in the bottle, this amazing ink goes on to paper wonderfully clear and invisible: it turns blue when the paper is held over a light bulb or other gentle heat source, and then disappears again as the paper cools.
Invisible Ink
(via Cool Hunting)
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