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https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13961814

Optics: a colour-circle, after M. E. Chevreul. Colour aquatint by R.H. Digeon, ca. 1868.

Original public domain image from Wellcome Collection

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Optics: a colour-circle, after M. E. Chevreul. Colour aquatint by R.H. Digeon, ca. 1868.

More