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COLOR 775 color film is seldom used for television or semi-professional 16 mm work. The integral tripack film is so much more convenient and easy. Kodachrome The best known film for color work is probably Kodachrome, followed closely by Ansco Color. Both films can be obtained for daylight and artificial light use. Kodachrome "commercial" posi- tive film is described as "commercial" stock because it is used for making films which have to be duplicated a number of times; it produces a low contrast positive color image. Kodachrome and Ansco Color both are reversal films and work the same way as do the ordinary black and white reversal film except that they are more complicated. "Commercial" film consists of three layers of emulsions, the bottom is red-sensitive, the top blue-sensitive, and the middle green-sensitive. Between the blue and green emulsion is a yellow filter to prevent blue from reaching the other layers. Due to the built-in filter effect, three images are produced, each one lacking some colors: the bottom image, on the red-sensitive emulsion, is cyan (minus red); the middle is a magenta (minus green); and a yellow image is on the top layer. Reversal Kodachrome Type A and daylight films are similar in principle. The only difference between the two emulsions is in the fact that daylight is balanced for sunlight exposure and Type A for use with photoflood lamps and other forms of artificial light. These films also use the subtractive method for color production. The emulsions are the same as for "commercial." The treatment during development is also similar. After the initial development when some fine emulsion grains still remain undeveloped, the film is exposed to white light in the same way as black and white re- versal film. A special dye is present in the developer for each layer in this second development. This forms three different colored layers. The same sequence of color layers is present and when light is projected through the film the various minus colors, cyan