Colour Measurement and Mixture by W. de W. Abney is a comprehensive exploration of the science and principles underlying the perception, quantification, and combination of colors. Written by a renowned physicist and pioneer in photographic science, this book delves into the fundamental theories of color, including the nature of light, the structure of the eye, and the psychological aspects of color perception. Abney meticulously explains the methods used to measure color, discussing the use of spectroscopes, colorimeters, and other scientific instruments of his time. The book also covers the laws governing the mixture of colors, both additive and subtractive, and provides practical guidance on how colors can be combined to achieve desired effects in art, industry, and science. Throughout the text, Abney illustrates his explanations with diagrams, experiments, and real-world examples, making complex concepts accessible to both students and professionals. He addresses the challenges of color reproduction in photography and printing, the standardization of color terminology, and the importance of accurate color measurement in various fields. The book also explores the historical development of color theory, referencing the work of Newton, Maxwell, and other key figures. With its blend of theoretical insight and practical application, Colour Measurement and Mixture remains a valuable resource for anyone interested in the science of color, from artists and designers to physicists and engineers.