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C > Colour Reversal Film - Pg. 68

C Colour Reversal Film 68 In 2009 Kodak announced the discontinuance of Kodachrome after 74 years. Colour reversal film produces a negative image in the camera but is processed to give a final positive colour image. This material is referred to by many names including Pos (positive) film, Slide film and Transparency film (`trannies'). Finished images can be printed using a direct positive dye- destruction system such as Ilfochrome, digitally scanned for reproduction or projected for viewing. Individual images are often mounted in plastic or card mounts as `slides'. There are two main processes. Kodachrome (introduced in 1936 for stills photography) is unique: its triple sandwich of black-and-white emulsions, sensitive to red, green and blue light, are dyed during processing to give outstanding colours and good longevity. All other modern colour films are chromogenic, with dye-couplers already in the emulsion layers. They are processed in E-6 chemistry (or equivalent). see Dye Destruction 98, Dynamic Range 100