more slowly, so that as the dye slowly enters the film the original negative is transformed into a positive produced in a colored dye. While one color is made in this way, the companion picture is also dyed in the other color, and the two, when placed together, make the finished picture. Since only two colors are used in the process, it is obvious that all colors cannot be correctly rendered, and the colors for which the process fails are the blues, violets, magentas, and purples. Light blues appear blue-green and violets, black; magentas appear pink, and purple, dark brownish-red. On the other hand, flesh tints of all kinds and all shades of red, orange or green, grays and blacks are well rendered. All these are predominant in portraits, and the results are -very satisfying for this class of work. l~ortraits produced by this process are in the form of transparencies, and are intended to be viewed in a special illuminator. The pictures appear at their best when placed in the special illuminator, giving much truer color rendering than when viewed by daylight.
The process cannot be used for the production of paper prints, and in most cases it is convenient to transform the original negative into the finished positive, but, if desired, duplicates can be made from contact prints of the negatives. The new process, according to its inventors, is not well adapted in its present form to outdoor subjects, especially when blue sky is included. The limitation of the process to transparencies must also be remembered. It represents, however, a highly satisfactory and practical method of obtaining beautiful color portraits having first-rate photographic quality and giving a pleasing reproduction of the colors of the original.