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Page four of Richard Harmerís 1856 patent application (No. 2832, "Stereoscopic Pictures") illustrating his technique.
Private collection of Paula Fleming
Only the original application was hand colored, but the line drawing identifies Harmer as the photographer of many of the tinted stereoviews of shells which are not otherwise credited.
Paula Richarson Fleming, July/August 2009 , "The Iridescent World of Bi-Colored Stereos", Stereo World, vol. 35, no. 1