A 1929 trade article by F. A. O. Krueger explaining how Wilhelm Ostwald's color system lets a color be specified by a number and letters, so it can be telegraphed and reproduced with a step photometer. It describes the Ostwald color measurement triangles and color circle from the Deutsche Werkstelle für Farbkunde in Dresden, and the pocket-sized reference charts and cloth-sample versions on silk, wool and cotton. It argues that the system standardizes dye shades, reduces dyestuff stock, simplifies color selection in mills and stores, and makes harmonious combinations easy to find. Includes a reproduced color circle chart.