28 Dec '11, 12am

Coffee Ring

Coffee Ring

When coffee stains it leaves a well defined edge on ring shaped pattern instead of undefined blob like you might expect. In a recent study, done by Peter Yunker at University of Pennsylvania, they showed that the definition to the coffee ring stain is formed due to the spherical shape of the particles in coffee. As the coffee evaporates the particles flow towards the edges thus forming the darker edge of the, ring shaped, coffee stain.

Full article: http://coffeecupnews.org/coffee-ring/

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