In the production of motion picture film it is becoming more common
to vary the color of the film either by toning or tinting or by a
combination of the two processes. Toning consists in either wholly
or partially replacing the silver image of the positive film by some
colored compound, the clear portions or highlights of the image,
consisting of plain gelatine, remaining unaffected and colorless.
Tinting, on the other hand, consists of immersing the film in a
solution of dye which colors the gelatine itself, causing the whole
picture on the screen to have a veil of color over it.