Discoveries at medieval alchemist Tycho Brahe’s former laboratory indicate he experimented with rare elements like tungsten, unknown in his time, while developing medicinal concoctions for diseases like the plague.
Medieval alchemists were notoriously secretive and didn’t share their knowledge with others. Danish astronomer and alchemist Tycho Brahe was no exception. Consequently, we don’t know precisely what he did in the alchemical laboratory located beneath his combined residence and observatory, Uraniborg, on the now-Swedish island of Ven.
Only a few of his alchemical recipes have survived and there are very few remnants of his laboratory. Uraniborg was demolished after he died in 1601, and the building materials were scattered for reuse. Only a few of his alchemical recipes have survived and there are very few remnants of his laboratory.
Discovery and Analysis of Alchemical Remnants
During an excavation in 1988-1990, some pottery and glass shards were found in Uraniborg’s old garden. These shards were believed to originate from the basement’s alchemical laboratory.
In a new study published in Heritage Science, scientists conducted chemical analyses on five of these shards—four glass and one ceramic—to which elements the original glass and ceramic containers came into contact with. They found enriched levels of trace elements were found on four of them, while one glass shard showed no specific enrichments
“Most intriguing are the elements found in higher concentrations than expected—indicating enrichment and providing insight into the substances used in Tycho Brahe’s alchemical laboratory,” said Professor Emeritus Kaare Lund Rasmussen of the University of Southern Denmark, who conducted the chemical analyses.
The enriched elements are nickel, copper, zinc, tin, antimony, tungsten, gold, mercury, and lead, and they have been found inside or outside the shards.
The Mystery of Tungsten in Brahe’s Laboratory
Most of the elements are not surprising for an alchemist’s laboratory. Gold and mercury were – at least among the upper echelons of society – commonly known and used against a wide range of diseases.
“But tungsten is very mysterious. Tungsten had not even been described at that time, so what should we infer from its presence on a shard from Tycho Brahe’s alchemy workshop?”, said Rasmussen.
Tungsten was first described and produced in a pure form more than 180 years later by the Swedish chemist Carl Wilhelm Scheele. Tungsten occurs naturally in certain minerals, and perhaps the element found its way to Tycho Brahe’s laboratory through one of these minerals. In the laboratory, the mineral might have undergone some processing that separated the tungsten, without Tycho Brahe ever realizing it.
Historical Context and Theoretical Explanations
However, there is also another possibility that Rasmussen emphasizes has no evidence whatsoever – but which could be plausible. In the first half of the 1500s, the German mineralogist Georgius Agricola described something strange in tin ore from Saxony, which caused problems when he tried to smelt tin. Agricola called this strange substance in the tin ore “Wolfram” (German for Wolf’s froth, later renamed to tungsten in English).
“Maybe Tycho Brahe had heard about this and thus knew of tungsten’s existence. But this is not something we know or can say based on the analyses I have done. It is merely a possible theoretical explanation for why we find tungsten in the samples,” said Rasmussen.
Tycho Brahe’s Medical Alchemy and Legacy
Tycho Brahe belonged to the branch of alchemists who, inspired by the German physician Paracelsus, tried to develop medicine for various diseases of the time: plague, syphilis, leprosy, fever, stomach aches, etc. But he distanced himself from the branch that tried to create gold from less valuable minerals and metals.
In line with the other medical alchemists of the time, he kept his recipes close to his chest and shared them only with a few selected individuals, such as his patron, Emperor Rudolph II, who allegedly received Tycho Brahe’s prescriptions for plague medicine.
We know that Tycho Brahe’s plague medicine was complicated to produce. It contained theriac, which was one of the standard remedies for almost everything at the time and could have up to 60 ingredients, including snake flesh and opium. It also contained copper or iron vitriol (sulphates), various oils, and herbs.
After various filtrations and distillations, the first of Brahe’s three recipes against plague was obtained. This could be made even more potent by adding tinctures of, for example, coral, sapphires, hyacinths, or potable gold.
Connection Between Astronomy, Alchemy, and Medicine
“It may seem strange that Tycho Brahe was involved in both astronomy and alchemy, but when one understands his worldview, it makes sense. He believed that there were obvious connections between the heavenly bodies, earthly substances, and the body’s organs. Thus, the Sun, gold, and the heart were connected, and the same applied to the Moon, silver, and the brain; Jupiter, tin, and the liver; Venus, copper, and the kidneys; Saturn, lead, and the spleen; Mars, iron, and the gallbladder; and Mercury, mercury, and the lungs. Minerals and gemstones could also be linked to this system, so emeralds, for example, belonged to Mercury”, explained senior researcher and museum curator Poul Grinder-Hansen from the National Museum of Denmark, who oversaw the insertion of the analyses into historical context.
Rasmussen has previously analyzed hair and bones from Tycho Brahe and found, among other elements, gold. This could indicate that Tycho Brahe himself had taken medicine that contained potable gold.
Reference: “Chemical analysis of fragments of glass and ceramic ware from Tycho Brahe’s laboratory at Uraniborg on the island of Ven (Sweden)” by Kaare Lund Rasmussen and Poul Grinder-Hansen, 25 July 2024, Heritage Science.
DOI: 10.1186/s40494-024-01301-6