He even found time on the day of the occupation to worry about the large gold Nobel Prize medals that Max von Laue and James Franck had given him for safekeeping.1290 Exporting gold from Germany was a serious criminal offense and their names were engraved on the medals.1291, 1292 George de Hevesy devised an effective solution--literally: he dissolved the medals separately in acid. As solutions of black liquid in unmarked jars they sat out the war innocently on a laboratory shelf.