France | 500 Francs, 1994 | Obverse: Portrait of Marie Skłodowska-Curie (1867-1934) and her husband Pierre Curie (1859-1906), who were French physicists. On their left, bottom, is represented a bulb containing radium salts photographed only with their acute luminosity. Red lines reproduce the graphic layout by Marie Curie in her study of probability curves for the action of X-rays on bacteria. | Reverse: A representation of the chemical laboratory of the department of the measurements of the Radium Institute established on the 21st of January 1914 | Watermark: Portrait of Marie Curie |