Kodak CP40R 6" (150mm) Red Acetate Color Printing Filter.

Kodak Color Printing Filters, are made on an acetate film base and are used singly or in combination for color correction of light sources in subtractive color printing. Color printing (CP) filters are similar to color compensating (CC) filters in that they control principally the red, green, or blue parts of the visible spectrum; unlike CC filters, CP filters cannot be used in the image-forming beam if optimum quality is desired.

KODAK Color Printing Filters (Acetate*) - Acetate filters used over the light source of enlargers and contact printers to effect color corrections. *Not suitable for image-forming optical systems.