Photograph of magazine article page, Southern California, 1940. "Dye Coupling for Color and Monochrome, By Howard C. Colton; Cyan, greens, Yellow, Blue, ,Black, Purples, Reds, Magenta; Color triangle sho[win]g the hue[s] which may be obtained through proper mixture of [color] dyes; The extremely rapid growth of color photograph during the last f[i]ve years has led many people t[o] believe that this phenomenal increase has been due to basically new processes. The actual facts indicate that the improvements in color printing h[a]ve been logical developm[ents] of processes or methods that have been in use for many years. One can go right through the gamut of imbihition, pigment, toning and dye coupling methods and find that the improved systems are due chiefly to the use of better or new materials and logical 'technique' improvements made on the original basic ideas of many years' standing., The most promising fields for color photography at the present time are those of dye bleaching and dye coupling. These systems are the basis of the 'newest' color processes. While these methods were naturally developed chiefly for use in three color photography, monochrome pictures can also be made using them as the basis. We shall try to give a general outline of the methods of the dye coupling system for use in both monochrome and tricolor photography., We should briefly mention the dye bleaching process before going on. The outstanding example of a dye bleaching system is to be seen in the Gaspar color process (best known in England) in which a three layered emulsion is coated so that each sensitized layer has the proper dye incorporated in it. After exposure, [de]velopmen[t] and fixation, the film is treated with cer[t]ain solu[t]ions which destroy the dye wherever there i[s] reduced silver in the emulsion layers. After the silv[er] is removed the film contains three colored dye images. The choices of dyes is of course very critical as the dye must be destroyed only where there is silver and strictly in proportion to the quantity of silver present; it must also be of the correct [ilg] and light-fast as well. Such fil is at present used only for positive printing as it is too slow to be exposed in the camera. An ingenious exposure system is used in printing the coated film stock so that each emulsion layer gets only one color record, the finished product being very satisfactory., Dye coupling methods are more tempting to the manufacturers at present as they are fast enough to be exposed in the camera, sub[ilg] for projection efficiency and can probably be improved until they at least approach the ideal system. With Kodachrome and Agfacolor at their present stages of development, it does not seem a very distant step to such materials coated for development to a negative. Such color negatives could then be masked photoelectrically during printing onto a similar emulsion which is developed to a positive. Such expected improvements in emulsions and processing of dye coupled films will undoubtedly lead to the general adoption of color by all. The complexity and exactness of processing, especially if done by negative-positive methods with automatic masking, will of course tend to keep the film processing in the hands of the sensitive materials manufacturers or at least in central processing plants. A singly coated one image emulsion is processed easily enough by anyone, but when we have three; 16 Photo Technique September 1939" -- on article.