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Optics: a colour-circle, after M. E. Chevreul. Coloured process print by R.H. Digeon, n.d. [c. 1868].

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Date

1868


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    Classification des couleurs d'après le systèm de M. Chevreul. Cercle chromatique des couleurs rabattues 4/10 de noir.



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      Credit: Wellcome Collection

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