Richard Harmer 1856 Page one of Richard Harmer's 1856 British patent application (No. 2832, "Stereoscopic Pictures") for the bicoloration of stereo photographs
British patent Private collection of Paula Fleming Paula Richarson Fleming, July/August 2009 , "The Iridescent World of Bi-Colored Stereos", Stereo World, vol. 35, no. 1
