The principles of harmony and contrast of colours, and their applications to the arts
Chevreul's 1872 London edition of The Principles of Harmony and Contrast of Colours, translated by Charles Martel, is a treatise on colour theory for artists, designers and manufacturers. Its plates are mostly diagrams: a square of ruled lines with lettered points, curved bands shaded in grey tones, and a table classifying dahlias by colour, with columns of named varieties and observations beneath.
