Comparative study between monochrome color roentgen film and standard black-and-white film.

Abstract

As with the convential black-and-white film, the blue roentgen film has silver halide as the light sensitive component. In addition, the emulsion contains a color coupler. The color film is developed in the same manner as the black-and-white film except for the use of a special developer which contains a color coupling developing agent. When the silver halide is reduced, as with conventional developing, the oxidation product of the developing agent reacts with the color coupler in the emulsion and the product of this reaction precipitates in the form of a dye. The amount of dye is proportional to the amount of reduced silver halide (Fig. 2). The developed color film thereby contains both silver and blue color pigment. The granularity of the film, as well as the total quantity of silver halide, is lower than that of the black-and-white film. Fixation takes place in a conventional fixing solution. Variation of the color temperature of the viewing light changes the contrast and latitude of a monochrome color image. The monochrome blue image has a low contrast and a high latitude when viewed with white light but a high contrast and a low latitude when viewed with yellow-red light, the complementary color to blue (Figs. 1 and 3). A gradual change occurs with progressive passage from white to yellow-red light. The blue image also has a