Hermann Wilhelm Vogel (26 March 1834 – 17 December 1898) was a German photochemist and photographer[1] who discovered dye sensitization, which is of great importance to photography.

After finishing school in Frankfurt (Oder), he studied at the Royal Industrial Institute of Berlin, earning his Ph.D. with Karl Friedrich August Rammelsberg in 1863.

While trying out some factory-made collodion bromide dry plates from England, Vogel was amazed to find that they were more sensitive to green than to blue.

He sought the cause and his experiments indicated that this sensitivity was due to a yellow substance in the emulsion, apparently included as an anti-halation agent.

[9] In addition to his work as a photographic technical innovator, Vogel taught Alfred Stieglitz between 1882 and 1886.