The series of books "Classical Library of Drawing" includes rare old editions that have both informative and bibliographic value. Russian Russian and German physicist, chemist and idealist philosopher, winner of the Nobel Prize in Chemistry in 1909, is one of the naturalists who made discoveries in the field of natural sciences. This book is a reprint of the work of the largest German scientist Wilhelm Ostwald ('Farbkunde'., published in Leipzig in 1923, and translated into Russian under the title 'Color Science' and published in the publishing house 'Promizdat' in 1926). Wilhelm Ostwald – Russian and German physicist, chemist and idealist philosopher, winner of the Nobel Prize in chemistry in 1909, refers to those naturalists who made discoveries, extremely important for the development of chemistry. In his scientific activity, he devoted a lot of time to research in the field of color theory. From 1910 to 1920, a number of works on the doctrine of color were published. Ostwald's goal in his deep study of color was to develop principles for selecting harmonious combinations that can be directly used in production. Even the book 'Farbkunde' had the full title: 'Color Science: A manual for chemists, physicists, naturalists, doctors, physiologists, psychologists, colorists, color technicians, printers, ceramics, dyers, weavers, artists, artisans, poster painters, pattern draughtsmen, milliners'.The study of harmonious color combinations, especially in modern representations, is impossible without familiarizing yourself with the Ostwald color circle. Although every day we see the embodiment of his work in the monitors of computers, smartphones, televisions, which reproduce the color in RGB encoding (red, green, blue — - red, green, blue), this system was developed on the basis of Ostwald's discoveries.Ostwald developed whole sets of paints for teaching in art schools and colleges. He prepared practical assignments on color studies, which were taught to generations of European artists. Ostwald's contribution to the study of color is enormous, and many of the systems of color analysis and ordering that exist today are based on his work. Despite his extensive scientific work, Ostwald continued to paint. Since 1915, he participated in exhibitions, in the 20s he organized large solo exhibitions."Color Science" is a book that covers the subject most comprehensively: along with a historical and critical sketch of the development of the theory of colors, it sets out Ostwald's essential theoretical points of view, his teaching about harmonic color combinations, along with a fairly detailed description of practical and applied methods for measuring colors, as well as the physical and chemical technology of coloring substances.