When did color photography become more popular?

History of Photography - Part 4:

From April 1935 to October 1936, physicist and chemist John Eggert and 26 other employees produced the world's first modern color film “Agfacolor New” in the Agfa film factory in small piece work. In particular, the chemists Dr. Gustav Wilmanns and Dr. Wilhelm Schneider succeeded in creating a universal Agfacolor process for slides, negatives, paper images and cinema films. The resulting Agfacolor process is based on the basic idea of ​​subtractive three-color photography with the components blue, green and red developed by Rudolf Fischer in 1912 by means of color development. The color films developed up to then were not yet perfect, but it was a race against time, especially against the US competitor Eastman Kodak. The first color film was completed in January 1936 and could be tested for the first time at the Olympic Games in Berlin in August. The prototype “Agfacolor-Neu-Film” was finally presented to the public in October 1936 in the form of a color slide film for daylight and a cine film. From 1936 to 1939 the Agfacolor negative / positive process was also worked out. With the help of color couplers, meaning colorless substances or substances provided with azo dye compounds, it was now possible to produce the three primary colors red, blue and green in photographic multilayer films after subtractive color mixing. This was achieved through a reaction of the color couplers with the oxidation product of the developer substance. Another sensation occurred in 1941 when the world's first feature film based on the colored positive-negative process, shot on Agfacolor film, was released. It was entitled "Women are better diplomats". A music film made by the German director Georg Jacoby and about the dancer Marie-Luise, who helps her uncle, a casino director, to save the casino, which was closed by a decision of the Frankfurt National Assembly.