Why do coffee stains dry to leave a ring?

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Offline thedoc

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Why do coffee stains dry to leave a ring?
« on: 24/08/2011 13:14:45 »
Scientists from the University of Pennsylvania have discovered how coffee spills evaporate to leave hollow circular stains, and how to leave a uniform deposition instead.

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« Last Edit: 24/08/2011 13:14:45 by _system »