Color charts and wheels included are: Dante Alighieri (1265-1321), The colours of Purgatory
Mediæval uroscopy charts, The colours of urine and their meanings
Philipp Otto Runge (1777-1810), The colour sphere
Johann Wolfgang Goethe (1749-1832), Colour spiral
George Field (1777-1854), Definitive or fundamental scale of colour
Honoré de Balzac (1799-1850), Nomenclature of The Human Comedy
Oliver Byrne (active 1830s to 1870s), A Euclidean colour wheel
Michel-Eugène Chevreul (1786-1889), Simple and contrast colours
Alphonse Bertillon (1854-1914), Notation of the color of the eyes
Alfred G. Mayer (1868-1922), Color mimicry
A silk merchant's colour thread card
Arthur Rimbaud (1854-1891), Vowels, 1871
Robert Ridgway (1850-1929), Orange-green-violet
Wilhelm Ostwald (1853-1932), Chromatic and achromatic standards
The colour of currency
After Charles Blane, Grammaire des arts du dessin 1870.