Why are coffee stains darker at the edges?
Question
There are many things around us that are so taken for granted that it never occurs to us to give them a second thought until we look a little closer. Coffee stains are one such thing. When coffee dries it leaves stains that are dark at the edges and lighter inside. The explanation may not be obvious but it is in fact rather simple.
Why are coffee stains darkest at the edges when they dry?
Asked By
Gunnlaugur Briem
Answer
There are many things around us that are so taken for granted that it never occurs to us to give them a second thought until we look a little closer. Coffee stains are one such thing. When coffee dries it leaves stains that are dark at the edges and lighter inside. The explanation may not be obvious but it is in fact rather simple. Image: Conquin, Inc.
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Dagsetning
Published27.12.2005
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Citation
Halldór Svavarsson. „Why are coffee stains darkest at the edges when they dry?“. The Icelandic Web of Science 27.12.2005. http://why.is/svar.php?id=5513. (Skoðað 13.5.2025).
Author
Halldór Svavarssondósent við tækni- og verkfræðideild Háskólans í Reykjavík
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