All colors e«- (epting blue ore Tillered oui and Ihis blue light posst-s on lo opusu a pluio ICI. thus (orming the blue record

The light romommg ofter passing through the Tirst mirror is ogain reflecti-d bv tie second minor 101 lo the red filler (El, thence lo the plata IFI, to form the 'red record '

Tho residual light posses lo the rear of Iho comervi. iind through tiie ore» n hlter iGi lo lonii Iho greon record ' at IMI

Tricolor cameras come «n and makes.

TWO METHODS of color photography are in general use. One requires a tricolor camera. A and B above, making simultaneously by one exposure three separate negatives on panchromatic plates, using color filters and mirrors. Process plates are prepared from these for three-color halftone or offset printing, or one of the photographic color printing processes such as Carbro or Wash-Off Relief. The other method uses color film or plates in an ordinary camera. Kodachrome and Dufay film. Lumiere and Finlay plates are examples. When developed they show the image as a color transparency which must be viewed by transmitted light, directly or by projection. For printing, three-color separation negatives are made from them by contact or enlargement. The Kodak exhibi-

'HE CAMERA AND ITS USE

tion at the New York World's Fair, 1939, shows Kodaclirome 35mm. film l" x 1^4" projected to 17' x 22' with perfect color rendering, clear definition, no grain, and a remarkable three dimensional effect. It is obtainable in 35mm. rolls and several sizes of cut film. Development at the Eastman plant in Rochester, New York, is included in the price. "Dufay color film, in both roll and cut film types may be used with almost any camera and developed anywhere. Lumiere and Finlay plates are used chiefly in lantern slide size or larger and are not difficult to develop.