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Re:Why soap bubbles are colourful and windowpanes are not by JKCalhoun on Sunday May 13, 2018 @05:20PM (#17061102)
A fascinating read from 1890, "Soap Bubbles and the Forces Which Mould Them", C. V. Boys. Talks about colors in a film of soap (and a primer on scientific deduction and reasoning) :

http://www.gutenberg.org/files/33370/33370-h/33370-h.htm

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