AUSTRIA (1973) Fritz Pregl*. Black print. Scott No 978, Yvert No 1265. Won Nobel Prize for improving known methods.
AVAILABLE AT $20
AUSTRIA (1979) Richard Zsigmondy*. Black print. Scott No 1133, Yvert No 1448. Nobel Prize for colloidal chemistry discoveries.
AVAILABLE AT $20
AUSTRIA (1989) Friedrich Emich*. Black print. Founder of modern microchemistry. Scott No 1489, Yvert No 1810.
AVAILABLE AT $20
NORTH KOREA (1998) Vinalon molecule*. Inventor working in lab*. Proof of souvenir sheet with color bars. Signed and dated on reverse. Scott No 3737, KSC No 3867.
AVAILABLE AT $75
BELGIUM (1948) Chemical industry. Black Ministerial Proof with embossed seal. Scott No 374. Yvert No 761.
AVAILABLE AT $50
BELGIUM (1948) Chemical industry. Black Ministerial Proof with embossed seal. Scott No 375. Yvert No 762.
AVAILABLE AT $50
BELGIUM (1955) Ernest Solvay. Ministerial proof. Scott No B573, Yvert No 973. Improved the process for making soda ash.
AVAILABLE AT $60
BELGIUM (1955) Jean-Jacques Dony. Ministerial proof. Scott No B574, Yvert No 974. Developed a process to purify zinc ores.
AVAILABLE AT $60
NORTH KOREA (2011) Ri Sung Gi. Marie Curie. Molecules. Photo proof from printer's archive. Scott No 5027. KSC No 4768D. Only 5-10 printed as test print prior to actual printing of the stamps. Each has official Korea Post stamp on reverse. International Year of Chemistry.
AVAILABLE AT $100
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