Stamp issued to publicize the 20th Congress of the International Union of Pure and Applied Chemistry (IUPAC), held in Moscow, July 12-18. The names of both the organization and the host city are spelled with chemical symbols. In addition, the stamp shows a molecular diagram of an unidentified substance and uses a retort as a background. The ink used for the globe diagram and the face value of the stamp (4 kopecs) are fluorescent.
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“Soviet Postage Stamp Commemorating 1965 IUPAC Meeting in Moscow.” Soviet Union, June 15, 1965. Witco Stamp Collection, Box 1. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/q524jn84j.
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