Colorano cachet includes a silk depiction of two alchemists in a laboratory. Stamp depicts chemical glassware and fluids.

Depicts Justus von Liebig, known for his work in agricultural and organic chemistry.

Cachet depicts Otto Hahn's equipment and the nuclear fission of uranium atoms. Stamp shows Hahn's diagram of the splitting of the uranium nucleus. Hahn was the Nobel Prize Winner for Chemistry in 1944.

Stamps depict Niels Bohr, the equation for the Bohr frequency condition (an equation relating to light frequency and electrons), and a diagram of the Bohr model of a hydrogen atom.

Cachet shows the Curie laboratory in Paris, and stamps depict Marie Curie with a bowl of radium.

Depicts awardees of the 1901 Nobel Prizes: Wilhelm Conrad Röntgen in Physics, Sully Prudhomme in Literature, Emil von Behring in Physiology or Medicine, and Jacobus Henricus van 't Hoff in Chemistry.

Stamp depicts Boeing 707, chemical apparatus, and heavy oxygen isotopes.

Stamp depicts measuring instruments.

Cachet, stamp, and postmark depict Louis Pasteur.

Cachet, stamp, and postmark depict Louis Pasteur.

Cachet, semipostal stamp, and postmark depict Louis Pasteur. A semipostal stamp is a postage stamp issued to raise money for a particular purpose (such as a charitable cause) and sold at a premium over the postal value.

Cachet, stamp, and postmark depict oil derricks.

Cachet created by Fleetwood depicts "The Chemist" along with ACS logo and the tagline, "Maker of a Better Tomorrow." Stamp issued to commemorate the diamond jubilee of the American Chemical Society. Addressed to and…

Cachet and stamp depict oil pipeline and drilling derricks.

First day cover created by Artmaster includes cachet depicting a 3D image of a nonexistent molecule. Stamp depicts chemical glassware. Envelope is signed by Herman S. Bloch, the inventor of the catalytic converter.

Cachet created by ArtCraft depicts a male and female chemist working in a laboratory setting, with text reading, "A Century of Modern Chemistry." Cover signed by Glen Seaborg.

Cachet and stamp depict Claude-Louis Berthollet. Cachet includes text describing Berthollet's contributions to water purification.

Cachet depicts a light beam passing through a prism to create a spectrum. Stamp depicts colors of the spectrum. The 15th Colloquium Spectroscopicum Internationale was held May 26-30, 1969 in Madrid, Spain.

Cachet depicts two chemists working in a laboratory.

Depicts logo of the Accra Assembly held in Ghana on June 21-28, 1962, together with three postage stamps of Ghana.

Cachet created by ArtCraft includes depictions of an Atomic Research Center. Stamp depicts a mushroom cloud from a nuclear explosion crossed out with an "x".

Tsinghua University is a research university located in Beijing, China, established in 1911. The stamp and postmark depict the atomic reactor at the University.

Cachet and stamp depict a mushroom cloud from a nuclear weapons test. Cachet was created by Fleetwood and the stamp was commissioned by the United Nations Postal Administration. Postmark depicts the United Nations…

Stamp printed in Belgium shows the Atomium and exposition emblem of the 1958 World's Fair in Brussels.

Cachet created by Colorano is a silk depiction of Rosalyn S. Yalow with text that describes the work which earned her the 1971 Nobel Prize in Medicine. Part of the Women's History Series (No. 83) by the National…