James Sowerby, A new elucidation of colours, 1809. Original, prismatic, and material, showing their
James Sowerby, A new elucidation of colours, 1809. Original, prismatic, and material, showing their concordance in three primitives, yellow, red, and blue, and the means of producing, measuring, and mixing them : with some observations on the accuracy of Sir Isaac Newton". Hand-colored engraving. Via Getty Museum -- source link
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