Colour and colour printing as applied to lithography : containing an introduction to the study of colour, an account of the general and special qualities of pigments employed, their manufacture into printing inks, and the principles involved in their application
Richmond's 1885 London treatise on colour and colour printing for lithographers, published by Wyman & Sons, and drawn from the Wellcome Library's holdings. The pictures are plain line diagrams: overlapping circles naming primary and secondary hues with their mixtures, and a labelled colour wheel. A designer could take from them a simple working scheme for how inks mix in overprinting, with red, yellow and blue at the base and orange, green, purple, olive, russet and citrine at the overlaps.
