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Digeon, René Henri, active 1866-1872 (1)
Silbermann, J (1)
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![Optics: colour scales for violet and yellow. Colour mezzotint [?] by R.H. Digeon, ca. 1868, after J. Silbermann.](https://iiif.wellcomecollection.org/image/V0025372/full/282%2C/0/default.jpg)