Sharpie on aerogel, A Sharpie pen being held up by a two in…

A Sharpie pen being held up by a two inch square block of aerogel (also called "solid smoke" or "frozen smoke"). Note that the absorption and scattering properties of the aerogel make it look hazy blue against the black background, and slightly yellow against the paper. The aerogel block here weighs approximately 500 milligrams.

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