Tru-Vue Stereochromes were shot on Ansco Color film, which tends to fade, as seen below (Dennis 1980). One of the key innovations was the replacement of standard 35 mm perforations on one side of the strip with widely holes that kept the stereo pairs correctly framed as the film was advanced.

This model of the viewer, which took take advantage of the new perforations (G. Mast 1943), was manufactured from 1947 to 1952, overlapping with the availability of Stereochrome filmstrips (Dennis 1980). Gifford M. Mast, the inventor, also invented the Mast Teaching Machine for his own company, Mast Development. His interest in 3D continued and in 1963 Mast Development Co. acquired the Keystone View Co., once the world's largest publisher of stereoviews. Mast eventually donated Keystone's photo archives to the University of California Riverside (S. Mast 2013).