this post was submitted on 13 May 2025
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Why are coffee stains darker at the edges? (www.why.is)
submitted 3 months ago by rssbot@lemmy.bestiver.se to c/hackernews@lemmy.bestiver.se
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[–] Lucien@mander.xyz 1 points 3 months ago

Not a very good explanation. They take for granted that liquid will rush to fill the areas of the drop where evaporation is happening faster rather than the drop just shrinking in size. This really should have been part of the explanation, too.