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176 FUNDAMENTALS and magenta, absorb red and green respectively, while yellow absorbs blue. Therefore, on projection, the reversed film provides its own filter system to reproduce the colors correctly. Du Pont Du Pont has now entered the field with a color release positive j film. It is not intended for use in cameras but only for making prints from three black and white negatives of the color separation type. It is a standard, integral tripack film, but it differs from others on the market in that the emulsion color layers contain only two components — silver halide and a synthetic polymer which is water-sensitive. The latter takes the places of the gelatin as well as the color former. The new color former is insoluble in water, and the polymer prevents contamination of other colors by it. The layer arrangement is different from standard practice, the color- sensitive layers being placed as follows, descending from the sur- face to the base: Emulsion Sensitivity Polymer Color Blue Magneta Red Cyan Green Yellow Film Base It will be noted that the yellow layer is on the bot- tom instead of the top. This is possible since printing is done on a registration printer and whichever color master film is desired can be directed to the proper layer by machine adjustment. It is interesting to note that this system is based on the fact that yellow is the least important color as far as definition is concerned, and the diffraction and diffusion effects produced by the passage of light through two layers are of no importance. A point of interest to the sound engineer is that the layer ar- rangement makes it possible to use a blue-sensitive photo-electric cell in the sound head with a dyed sound track. This improves both volume and quality. If daylight film, which has been balanced chemically for day- light, is exposed by artificial light, the correction which may be