Hermann Wilhelm Vogel
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Hermann Wilhelm Vogel (1834 – 1898) was a German chemist and photographer who discovered dye sensitization (1873), a pivotal contribution to the progress of photography. He was an influential teacher for Alfred Stieglitz, whose classes and laboratory practice he attended at the Charlottenburg Polytechnic (Berlin). Vogel’s work in photochemistry was well known in the 1880s. His discovery of "optical" or "color" sensitizers resulted in the introduction of orthochromatic film, which was sensitive to all colors, except the notoriously problematic red end of the spectrum.
