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Photography in Philately

A Krzysztof K. Słowiński Collection

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Item no. C250 (cancel)

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Item no. C250 (cancel)

Type: cancel

Country: USA

Date of use: 5 March 1979

Special cancel (CTO) on cover advertising an event “Pittsburgh Conference on ANALYTICAL CHEMISTRY and Applied Spectroscopy” that was held in Cleveland (Ohio, USA). The cancel’ slogan reads: “Photography-Optics-Chemistry-Spectroscopy – Working Together”and shows the chemical formula of hydroquinone, a major component of most photographic developers for b/w materials.

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