Post Cards: Chrome Era -- 1939 to Present - By: Aubrey Walker, 2009-01-09

In 1939 the Union Oil Co. of California began publishing postcard views of Southwestern scenes which were given away as premiums in the company's service stations. The Union Oil cards introduced new printing technology. Cards were printed in four-color half-tone process with a varnish overcoat called photochrome probably because of their link to Kodak's newly introduced Kodachrome color reversal

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