Word: collodion
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Dates: during 1920-1929
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Negatives at that time were made on wet plates, a sheet of glass covered with collodion and silver nitrate (sensitive to light) a few minutes before exposure. George Eastman, no scientist himself, tried empirically to invent dry plates covered with silver nitrate and gelatine. After trials and troubles which a thorough knowledge of colloidal chemistry, as he later learned, might have prevented, he succeeded in this effort...