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TOPICALS / THEMATIQUES

586 Chemistry / Chimie Other proofs
Lot No Type Description Price
6790 EP image BELGIUM (1948) Chemical industry. Black Ministerial Proof with embossed seal. Scott No 374. Yvert No 761.
AVAILABLE AT $50
6791 EP image BELGIUM (1948) Chemical industry. Black Ministerial Proof with embossed seal. Scott No 375. Yvert No 762.
AVAILABLE AT $50
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
6797 EP image FRANCE (1958) Berthollet*. Sepia printer's proof. Berthollet was a chemist who proposed that the rate of chemical reactions was dependent on their concentration. Scott No 872, Yvert No 1149. Very rare!]
AVAILABLE AT $250
15853 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
15855 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

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