Richard Harmer 1857 (ca) Bicolored stereoview matching Harmer's patent application, it carries the Royal Warrant and London Stereoscopic Company blindstamp
Stereoview Private collection of Paula Fleming The deep colors of the shells tend to flicker when viewed in 3D rather then blend together in an iridescent affect.
Paula Richarson Fleming, July/August 2009 , "The Iridescent World of Bi-Colored Stereos", Stereo World, vol. 35, no. 1
