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Wiki of "Coffee ring"
See Wikipedia about "Coffee ring"!

http://en.wikipedia.org/wiki/Coffee_ring

Recently, Byung Mook Weon and Jung Ho Je of Pohang University of Science and Technology showed an observation of reverse particle motion that repels the coffee-ring effect because of the capillary force near the contact line.[3] The reversal takes place when the capillary force prevails over the outward coffee-ring flow by the geometric constraints.

B. M. Weon, J. H. Je (2010). "Capillary force repels coffee-ring effect". Phys. Rev. E 82: 015305(R). doi:10.1103/PhysRevE.82.015305. 

 
 
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