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Autochrome

Lumière Autochrome was invented in 1907 by the Lumière brothers, an expensive, difficult process that required long exposures with complex development. in the 1880’s Hans Jakob Schmid worked for a a Swiss printing company Orell Gessner Füssli where he invented a process for colorizing negatives called “Photochrom.”

The process, wildly popular in the 1890s, used a lithographic limestone tablet—typically called a “litho stone”—to be covered in a thin layer of mixture (purified bitumen dissolved in benzene).  A reversed half-tone negative was then pressed against the coating and then exposed to sunlight, which could range from 10 minutes to hours.

 

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