 The exposed film was developed like ordinary black-and-white film, producing a series of black-and-white silver images on each side.These were then chemically converted into single-color images of a color roughly complementary to that being used for the images on the other side and to the color of the camera filter used when filming them.The resulting superimposed pairs of transparent single-color images, projected onto a screen or viewed directly, could reproduce a limited but useful and sometimes very pleasing range of color.