With the help of admixtures of copper and silver, different colour impressions can be achieved (Figure 1). Furthermore, gold is stable to environmental influences and is non-toxic [1]. Extraction of the yellow metal is complex and expensive, which is why the alchemists of yore tried to make it from readily available materials. But even the renowned alchemist Albert the Great had to concede that he himself never actually succeeded in producing gold artificially. "In truth, these are only superficial, apparent transmutations, in which only the appearance of the metals is changed, but never their inner essence" [2]. ...