purchase Castle Frankenstein in exchange for his elixir formula, which he claimed he had recently discovered; the offer was turned down. According to Stahl, Dippel and the pigment maker Diesbach used potassium carbonate contaminated with this oil in producing red dyes. To their surprise, they obtained a blue pigment "Berliner Blau", also called "Preussisch Blau" or "Prussian blue". There are claims that during his stay at Castle Frankenstein, he practiced alchemy and anatomy. He was allegedly working with nitroglycerin, which led to the destruction of a tower at the Castle Frankenstein. But this seems to be a modern myth, for it is an anachronism. Nitroglycerin hadn't been discovered in Dippel's time. And although the history of the castle during Dippel's lifetime is well documented, the destruction of a tower – though surely a remarkable event – is nowhere mentioned. Other rumours about Dippel appear to be modern inventions, too. For example, that which said he performed experiments with cadavers, in which he attempted to transfer the soul of one cadaver into another. Soul-transference with cadavers was a common experiment among alchemists at the time and was a theory that Dippel supported in his writings, thus making it possible that Dippel pursued similar objectives, but there is no direct evidence to link him to these specific acts. There is also no evidence to the rumour that he was driven out of town when word of his activities reached the ears of the townspeople — though he was often banned from countries, notably Sweden and Russia, for his controversial theological positions. He also eventually had to flee to Giessen after killing a man in a duel. Dippel did, however, experiment quite frequently with dead animals, of which he was an "avid dissector". In his dissertation Maladies and Remedies of the Life of the Flesh, Dippel claims to have discovered both the elixir of life and the means to exorcize demons through potions that he concocted from boiled animal bones and flesh. This is the same essay in which Dippel claimed to believe that souls could be transferred from one corpse to another by using a funnel. Some of Dippel's contemporaries, notably Johann Heinrich Jung, believed that toward the end of his life, Dippel lost his faith altogether after years of bitter disputes with other Christian leaders. Calling Christ "an indifferent being", Dippel shifted all of his energy exclusively on his alchemical experiments.