Numerous specimens still exist of what is alleged to be artificial gold made by the alchemists of a past age. Of all these the most striking is a large medallion, bearing in relief the heads of Emperor Leopold and his ancestors of the House of Hapsburg. It is related that on the name day of the emperor in 1677, this medallion, originally of silver and weighing 7250 grains, was transmuted into gold by Wenzel Seiler, a noted alchemist of that time. This wonder was performed in full view of the emperor and his courtiers, by dipping the medallion in a solution. As there are four notches on the edge, it has been conjectured that these were made to secure material for testing the quality of the transformed metal. However, the simple test of specific gravity shows that the metal cannot be gold, for according to Bauer’s calculation made in 1883, the medallion has a specific gravity of 12.67, between that of silver (10.5) and that of gold (19.27). This might indicate that in some unexplained way the alchemist had succeeded in precipitating a coating of gold upon the face of the object. It seems probable that the deception was soon discovered, for Seiler, who had been knighted on September 16, 1676, was exiled by order of Emperor Leopold, not long after the date on which the supposed transmutation is said to have taken place. An exceedingly rare medal, and one of great interest to students of alchemy, was struck in 1647 by order of Emperor Ferdinand III from gold produced in his presence by Johann Peter Hofmann, a master of the alchemical art. A specimen of this medal is in the Imperial Cabinet of Coins in Vienna.[27] On the obverse, around two shields, one bearing eight fleurs-de-lis and the other the figure of a lion, are two hermetic inscriptions: LILIA CUM NIVEO COPULANTUR FULVA LEONE (yellow lilies lie down with the snow-white lion), and SIC LEO MANSUESCET SIC LILIA FULVA VIRESCENT (thus will the lion be tamed and thus will the yellow lilies flourish). Around a crown surmounting the two shields appear the initial letters I. P. H. V. N. F., indicating Latin words the sense of which is “Johannes Petrus Hofmann a Nurembergian subject made it,” and also the letters T G V L, intended to signify _tinturæ guttæ v. libram_, or “five drops of the tincture [transmuted] a pound.” The reverse has Latin words denoting that iron was the base of this tincture, the symbols used for lead, tin, copper, mercury, silver and gold being each accompanied by a cryptic declaration that Mars (iron) had controlled the respective metal.[28]