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Photography in Philately

A Krzysztof K. Słowiński Collection

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Item no. P983 (cover)

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Item no. P983 (cover)

Type: cover

Country: USA

Date of use: 29 June 1934

Business stationery (cover) used by the MALLINCKRODT CHEMICAL WORKS in St. Louis (Missouri, USA), a chemical factory (operating since 1867) producing various products, also chemicals for photographic purposes that were described in “Mallinckrodt Photographic Chemicals” (e.g. issue 1943). It was for some time (since 1880) a major producer of bromides for photography. Mallinckrodt published manual (several times reissued) “The Chemistry of Photography” (1931).

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