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- Michigan School of Mines, now Michigan Technological University, Houghton, Michigan, circa 1906 - From 1895 to 1924, the Detroit Publishing Company was one of the major image publishers in the world. It had a wide-ranging stock of original photographs, many of which were colored using the company's patented "Phostint" process. Popular "Phostint" postcards, the Detroit Publishing Company claimed, were delicately "executed in Nature's Coloring" to be truthful, tasteful, beautiful, and educational.

- circa 1906
- Collections - Artifact
Michigan School of Mines, now Michigan Technological University, Houghton, Michigan, circa 1906
From 1895 to 1924, the Detroit Publishing Company was one of the major image publishers in the world. It had a wide-ranging stock of original photographs, many of which were colored using the company's patented "Phostint" process. Popular "Phostint" postcards, the Detroit Publishing Company claimed, were delicately "executed in Nature's Coloring" to be truthful, tasteful, beautiful, and educational.