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30-Mar-2020 06:52

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Only one company, The Detroit Publishing Company, was licensed in the United States to produce Photochrom images.

What we do know is that the original black and white negative was reversed into a halftone positive and then exposed to highly polished limestone litho stones covered with the chemical bitumen.

Dating from 1899, it depicts a section of the harbor of Algiers.

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So I’m going to repeat the basic premise several times: Every image here was made from a black and white photograph with the colors added through a patented lithographic process that relied on photographer’s notes to accurately reproduce the colors.The colors are absolutely permanent and attain the virility and strength of nature so often lacking in hand colored work.