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producing on a commercial scale crop out in unexpected places, thus delaying the progress of the industry.
Coloring Two methods of coloring films are as follows:
First: Those in which the color separation images are in black and white, representing the Red and Green values alternating throughout the length of film. The entire image area of the Red value pictures are dyed that color over the black records and the same for the Green records. The pictures may be projected at high speed to overcome the pulsation of the colors, or on a special machine which exposes two images at one time and superimposes them on the curtain. This system is not adapted to present standard methods of projection.
Second: The conversion of the silver images to color is one means available if the pictures are to be produced on the subtractive basis. This method gives us clear gelatine in the whites, the black being made up of a full density of the colors used. The print from the red negative is colored its complementary color green-b^.ue and the print from the green-blue is colored red.
Broadly — the silver is converted to a salt or a compound capable of holding dye.
(/) Traube, U. S. Patent No. 1,093.503 of 1914. Silver converted to silver iodide, dyed, and the more or less opaque iodide removed. Uses basis dyes. {2) Miller, U.S. Patent No. 1,214, 940 of 1917, produces a transparent mordant by treating the silver image in iodine, and potassium iodide. This fixes basis dyes, (j) Wm. F. Fox, U. S. Patent No. 1,256,675 of 191 8, provides for toning by Ferric Salts for the Blue and with Uranium for the Red. {4) W. L Crabtree, The Photographic Journal, August, 191 8. Toning with Copper to provide a mordant for basic dyes. The following is just the reverse of the above. The dye goes into the clear untanned gelatine.
(5) J. G. Capstaff, English Patent No. 13,429 of 191 5. The silver image is bleached and tanned so that the dye goes into the gelatine in proportion to the amount of silver that was present. A negative gives a negative. So it is necessary to use a positive print in order to obtain a dye positive. This process is known commercially as Kodakchrome.
Negatives As in black and white photography, you must "get it in the negative" before it is possible to get it on the screen in anything like natural colors.
The camera controls these vital questions:
{e) Exposure
(/) Fringing (Result of rapid action where single records are
made successively.) {g) Parallax (Result of taking through multiple objectives so
that portions of the view do not register.) The suggested or tried methods for overcoming parallax and fring
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