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Thumb ticker physicists discover

Physicists discover why drying liquid crystal drops leave unusual 'coffee rings'


Penn alumnus Zoey Davidson, now a postdoc at the Max Planck Institute for Intelligent Systems in Germany, had been experimenting with Sunset Yellow, a dye that gives Doritos and orange soft drinks their bright colors, when he accidentally spilled some of the material.


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Metin Sitti
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Zoey Davidson
Postdoctoral Researcher