A new elucidation of colours, 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
James Sowerby's 1809 London treatise arguing that yellow, red and blue are the three primitive colours, published by Richard Taylor for painters, chemists and readers debating Newton's optics. Hand-coloured engraved plates set stepped black bars and measuring scales against fine colour gradients, striped binary mixtures and a hazy sun with prismatic halo — useful for chart geometry, ruled colour bands and atmospheric washes.
