In this application, only a silver image is formed the bleach step of the C-41 process is not used, as it would destroy the image. Some photographers have used C-41 developer to develop high-contrast black-and-white films, such as traffic surveillance film and Kodak's Technical Pan film this is done in order to lower the contrast. Instead, C-41 negatives and prints have clouds of dye, causing the resulting image to appear different from that of silver grain. The image on the C-41 films, however, does not contain silver. On an image from regular black-and-white film, the individual silver particles forming the image are seen as grain. While they may not appear to have grain, this statement is technically incorrect. These couplers, located in the blue, green and red-sensitive layers, produce yellow, magenta and cyan dyes, respectively, when developed. Each emulsion layer, in addition to the light-sensitive components, contain chemicals called dye couplers. It is often said that prints from these films do not have grain. C-41 Processing can not be done on TRUE black and white negatives. Conversely, the clear-based Ilford and Fuji films sometimes results in off-color prints on color paper, but can be optically printed on black-and-white paper, just like any other black-and-white film. The orange base on the Kodak film allows them to be printed with correct blacks on standard color printing machines, but this film can be difficult to print on multigrade black-and-white paper, whose contrast is determined by the use of a colored filter during the printing process. It has a nominal sensitivity of ISO 400/27°, however can be under- or overexposed in order to adjust contrast as well as the balance of grain and sharpness. The Kodak film has the same orange base as color C-41 films the base on the Ilford and Fuji films are clear. Ilfords XP2 Super is a high-speed chromogenic black and white negative film that can be processed alongside conventional color negative films in C-41 chemistry. Although they may have multiple layers, all are sensitive to all colors of light, and are designed to produce a black dye. These films work like any other C-41 film development causes dyes to form in the emulsion. Fuji, a Japanese company, markets a third film called Neopan 400CN, which is also manufactured by Ilford. Ilford, a British company, produces a similar film known as XP2 Super. While C-41 is usually considered a color process, Kodak, an American company, manufactures a C-41 black-and-white film called BW400CN.
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