English: The coffee ring effect is a phenomena that involves a concentrated ring of precipitate that forms on the edge of a drying drop of liquid (not necessarily coffee). This image actually did use coffee for the effect.
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I used my iPhone to take a picture of a dried coffee stain of my own creation.
{{subst:Upload marker added by en.wp UW}} {{Information |Description = {{en|The coffee ring effect is a phenomena that involves a concentrated ring of precipitate that forms on the edge of a drying drop of liquid (not necessarily coffee). This image a...