UNITED STATES POST OFFICE on 4 September 1951, in New York City, issued a violet-brown coloured 3-cent stamp celebrating the 75th anniversary (Diamond Jubilee) of the American Chemical Society (ACS), which was founded in 1876.
The design incorporated the official emblem of the American Chemical Society. Also included in the design was an alembic (an early distilling apparatus), a hydrometer, and a modern ionisation indicator. The right side of the stamp featured the "chemical century" with industrial structures, including a catalytic cracking plant, a butadiene reactor, and a fractionating unit.
Approximately 110–117 million stamps were released.
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