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TOPICALS / THEMATIQUES

586 Chemistry / Chimie Other proofs
Lot No Type Description Price
6793 EP image BELGIUM (1955) Ernest Solvay. Ministerial proof. Scott No B573, Yvert No 973. Improved the process for making soda ash.
AVAILABLE AT $60
6794 EP image BELGIUM (1955) Jean-Jacques Dony. Ministerial proof. Scott No B574, Yvert No 974. Developed a process to purify zinc ores.
AVAILABLE AT $60
15885 EP image GERMANY (1964) Benzene ring*. Photo essay (See Note) (unaccepted) for centenary of discovery of benzene ring by Kekul├ę. Measures 90 x 120 mm. Scott No 892, Yvert No 310.
AVAILABLE AT $75
15887 EP image AUSTRIA (1995) Josef Loschmidt*. Black proof. Loschmidt first determined the diameter of a molecule using the kinetic theory of gases. Scott No 1682, Yvert No 1992.
AVAILABLE AT $20
24673 EP image AUSTRIA (1973) Fritz Pregl*. Black print. Scott No 978, Yvert No 1265. Won Nobel Prize for improving known methods of quantitative organic microanalysis.
AVAILABLE AT $20
24674 EP image AUSTRIA (1979) Richard Zsigmondy*. Black print. Scott No 1133, Yvert No 1448. Nobel Prize for colloidal chemistry discoveries.
AVAILABLE AT $20
24675 EP image AUSTRIA (1989) Friedrich Emich*. Black print. Founder of modern microchemistry. Scott No 1489, Yvert No 1810.
AVAILABLE AT $20

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