Richard Leach Maddox is best known for his invention of lightweight gelatin negative plates. He created this process in 1871. Before he created this process, he was known for photomicrography, which is photographing organisms under the microscope. Maddox was noticing that the wet collodion was affecting his health. Maddox suggested that sensitizing chemicals cadmium bromide and silver nitrate should be put on a glass plate in gelatin. Photographers could use dry plates off the shelf instead of having to prepare their own emulsions.
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