| Hermann Krone Herschel-Hunt: Cyanotypie, mit Kaliumferricyanid. 1836 - 1839 [Didactic panels, Historisches Lehrmuseum für Photographie - Tafel 111] 1896 (after) Didactic panel Institut für Angewandte Photophysik - Institute of Applied Photophysics LL/47571 One of a series of 141 didactic panels (German) created by Krone containing 1,100 photographs which outline the history of photography upto 1896.
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