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Aquatints (3)
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Optics (7)
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Chevreul, M. E. (Michel Eugène), 1786-1889 (1)
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Digeon, René Henri, active 1866-1872 (8)
Silbermann, J (4)
Ronjat, Etienne Antoine Eugène, 1822- (1)
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![Optics: crystals exhibiting interference colours. Colour mezzotint [?] by R.H. Digeon, ca. 1883, after J. Silbermann.](https://iiif.wellcomecollection.org/image/V0025370EL/full/282%2C/0/default.jpg)
![Optics: crystals exhibiting interference colours. Colour mezzotint [?] by R.H. Digeon, ca. 1883, after J. Silbermann.](https://iiif.wellcomecollection.org/image/V0025371/full/282%2C/0/default.jpg)
![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)