What is "used book smell?"

In this short video, Richard from ABEbooks describes the distinctive smell of old books ("a combination of grassy notes with a tang of acids and a hint of vanilla, with an underlying mustiness") caused by hundreds of volatile compounds released during the slow oxidization of the paper, glues and inks. Why Do Old Books Smell? [...]

Source: http://boingboing.net/2012/04/13/what-is-used-book-smell.html

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