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I'm unsure how to edit pictures, but I'm sure that the current picture does not show the coffee ring effect, but rather just a coffee stain. — Preceding unsigned comment added by 145.116.190.25 (talk) 09:01, 3 November 2014 (UTC)[reply]
^"Suppressing the coffee stain effect: how to control colloidal self-assembly in
evaporating drops using electrowetting" H. B. Eral,D. Mampallil Augustine,M. H. G. Duits and F. Mugele; Soft Matter, 2011, 7, 4954