color theory

Table II from <n>Pier Andrea Saccardo</n>'s 1891 color guide, <n>Chromotaxia, seu nomenclator colorum</n>.

A diagram from <n>James Sowerby</n>'s 1809 book, <n>A New Elucidation of Colours</n>.

<n>Tobias Mayer's Color Triangle</n> from 1775, published by <n>Georg Christoph Lichtenberg</n>.

Color charts from the 1890 book <n>The Principles of Harmony and Contrast of Colors</n> by <n>Michel Eugène Chevreul</n>.

<n>Plate 16, Principles of the science of colour</n> by <n>William Benson</n>, 1868.