Process DescriptionThe POP Silver Gelatin Process involves the following steps:1. POP photographic paper is placed under a negative in a special copy frame.2. The copy frame assembly is exposed to daylight or artificial light until the image is developed to the desired image intensity. Guides showing approximate exposure times were usually available from paper manufacturers for different lighting conditions, but some testing was necessary to find good exposure conditions for a given combination of light and negative. POP requires a certain level of overprinting because the intensity of the image decreases during processing.3. The exposed POP is washed in a water bath to remove any excess soluble silver salts.4. The washed POP is tinted using different types of gold and platinum toners or by using a gold toner first and then a platinum toner. Some coloring formulas found in early 19th century photographic literature also recommend using palladium or iridium coloring. However, even after analyzing thousands of POP silver gelatin photographs, we still have not identified any existing photographs tinted in this manner.5. The toned POP photograph is washed again to remove toning chemicals and fixed using standard hypo (sodium thiosulfate) fixative.6. The toned and fixed photograph is thoroughly washed under running water or with several water changes in a water tray.7. The washed photograph is air dried or surface polished by scraping the print onto clean, polished glass and allowing it to dry. Fully dried photography usually separates from the glass surface on its own. DOP SILVER GELATIN PROCESS The main difference between the POP and DOP silver gelatin processes lies not in the internal structure of the photographic material but in the way the silver base.... .. middle paper......y and could only be seen by reflected light, however, researchers continued to look for improvements and alternative color processes. In 1935, Leopold Godowsky, Jr., and Leopold Mannes, two American musicians working with Kodak Research Laboratories, launched the modern era of color photography with the invention of Kodachrome film. With this reversible film (slide), color transparencies could be obtained suitable for both projection and reproduction. A year later, the German company Agfa developed the Agfacolor negative-positive process, but due to World War II, the film was not available until 1949. Meanwhile, in 1942, Kodak introduced the negative-positive film Kodacolor which, 20 years later - after many improvements in quality and speed as well as a big reduction in price - would become the most popular film used for amateur photography .