Recent analysis of centuries-old pottery fragments from the laboratory of Renaissance astronomer-alchemist Tycho Brahe has revealed the presence of tungsten—a metallic element that was not officially identified until nearly 200 years after his death.
The discovery, published in the journal Heritage Science in July 2024, raises profound questions about what Renaissance alchemists knew and when they knew it.
The finding challenges conventional narratives about the history of chemistry and suggests that pre-modern scientists may have encountered and even used elements whose formal identification came much later.
Excavating the Secrets of Uraniborg
Between 1988 and 1990, archaeologists excavated the site of Uraniborg, Brahe's palatial observatory on the Swedish island of Ven (then part of Denmark). King Frederik II granted Brahe the island in 1576 as a lifelong fief, providing him with resources to construct what became Europe's first purpose-built astronomical research facility.
The complex included not only observation towers but also a basement alchemical laboratory equipped with 16 furnaces for heating, distillation, and producing medicinal preparations.
After Brahe's death in 1601 and subsequent exile of his collaborators, Uraniborg was systematically demolished by royal decree, with the destruction completed around 1650. For centuries, the site lay abandoned, its stones repurposed for humbler buildings.
Initial excavations in 1824 identified the circular basement laboratory and traces of two ovens, but the most revealing artifacts emerged from the later dig in the old garden area.
Among hundreds of pottery and glass fragments recovered were five shards—four glass and one ceramic—that appeared to originate from the alchemical laboratory.
These fragments lay dormant in a Swedish museum for over three decades before researchers from the University of Southern Denmark and the National Museum of Denmark obtained permission to analyze them.
Advanced Analysis Reveals Hidden Chemistry
Professor Emeritus Kaare Lund Rasmussen and senior researcher Poul Grinder-Hansen employed Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS), a high-precision analytical technique that converts sample molecules into charged ions to identify trace elements.
The team examined cross-sections of the shards, testing for 31 different trace elements on both interior and exterior surfaces.
One shard showed no enrichment, serving as a control specimen. The other four, however, revealed elevated concentrations of multiple elements.
Copper, zinc, nickel, tin, antimony, gold, mercury, and lead appeared in higher-than-expected quantities—elements consistent with Renaissance alchemical practices.
But tungsten's presence defied all expectations.
The Tungsten Enigma
"Tungsten is very mysterious," Rasmussen stated. "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?"
The element tungsten was not isolated as a metal until 1783, when Spanish brothers Juan José and Fausto Elhuyar achieved its extraction by reducing tungsten ore with charcoal at the Royal Basque Society in Bergara.
Swedish chemist Carl Wilhelm Scheele had extracted tungstic acid from the mineral scheelite two years earlier, in 1781, but lacked the furnace capacity to produce the pure metal. Even these late 18th-century achievements came 180 years after Brahe's death in 1601.
Yet there tungsten was, embedded in the surfaces of glassware from Brahe's laboratory.
Rasmussen outlined two plausible explanations. Tungsten occurs naturally in minerals such as scheelite (calcium tungstate), wolframite (iron-manganese tungstate), ferberite, and hübnerite.
Brahe may have processed tungsten-bearing minerals without realizing they contained an unknown element, inadvertently incorporating tungsten compounds into his preparations.
The second theory is more tantalizing. German mineralogist Georgius Agricola, in his 1546 work "De Natura Fossilium," described an unusual substance called "wolfram" that formed during the smelting of tin ore. This substance interfered with metal reduction processes and produced peculiar slag.
Brahe's medicinal practices drew heavily from German chemical traditions. "Maybe Tycho Brahe had heard about this and thus knew of tungsten's existence," Rasmussen speculated, though he cautioned this remained theoretical.
The Alchemist-Astronomer's Worldview
Understanding why an astronomer engaged in alchemy requires grasping the Renaissance conception of reality. "It may seem strange that Tycho Brahe was involved in both astronomy and alchemy, but when one understands his worldview, it makes sense," Grinder-Hansen explained.
Brahe believed in fundamental connections between celestial bodies, earthly substances, and human organs—a comprehensive system of correspondences that unified the cosmos.
In this framework, silver linked to the Moon and the brain; gold to the Sun and the heart; tin to Jupiter and the liver; copper to Venus and the kidneys; lead to Saturn and the spleen; iron to Mars and the gallbladder; and mercury to Mercury and the lungs.
These associations were not merely symbolic but considered operative principles governing both celestial motion and terrestrial transformation. Alchemists believed that by manipulating earthly elements according to these cosmic patterns, they could create medicines that harmonized the human body with universal forces.
Gold and mercury featured prominently in Renaissance medicine, particularly among the social elite. Rasmussen had previously analyzed hair and bone samples from Brahe's exhumed remains in 2016, finding gold concentrations 20 to 100 times higher than normal modern levels.
The evidence suggested Brahe consumed medicines containing "potable gold"—gold preparations dissolved or suspended in liquid. This practice, rooted in medieval alchemy, held that gold's incorruptibility could transfer vitality to those who ingested it.
Medicamenta Tria and the Paracelsian Influence
The elements detected on the laboratory shards align with three famous medicines attributed to Brahe: the Medicamenta Tria, or "Three Medicines".
Though Brahe maintained secrecy about his recipes—a common practice among Renaissance alchemists protecting proprietary formulations—later sources reconstructed their general composition.
One preparation targeted epidemic diseases and infectious contagions; another treated epileptic conditions; the third addressed skin and blood disorders including scabies, chronic venereal diseases, and elephantiasis.
Copper, antimony, gold, and mercury formed the core ingredients according to these reconstructions.
Brahe's approach reflected the influence of Paracelsus (1493-1541), the Swiss physician-alchemist who revolutionized medical practice by introducing mineral-based medicines.
Paracelsus challenged the dominant Galenic medical tradition, which had prevailed for 1,500 years, arguing that chemistry should serve medicine by extracting healing quintessences from minerals and metals. His emphasis on mercury, antimony, copper, lead, and gold transformed Renaissance therapeutics.
Brahe's most complex preparation was his plague remedy—an elaborate concoction containing up to 60 ingredients including snake flesh, opium, copper, oils, and herbs.
Whether tungsten entered this formulation remains unknown, but the possibility cannot be dismissed.
Implications for Science History
The tungsten discovery highlights how much remains unknown about pre-modern scientific practices. Lawrence Principe, director of the Singleton Center for the Study of Premodern Europe at Johns Hopkins University, noted the finding's significance: "The discovery of tungsten residue is quite surprising.
Tungsten ores are relatively scarce, and we know very little about how extensively they may have been experimented with during the early modern period".
The research reveals the interconnected nature of Renaissance scientific disciplines. What modernity separates into distinct fields—astronomy, chemistry, medicine, mineralogy—existed as integrated knowledge systems for figures like Brahe.
Studying celestial motions and manipulating terrestrial matter represented complementary approaches to understanding nature's fundamental principles.
The analysis also demonstrates archaeology's capacity to recover information lost to textual records. Brahe's secrecy meant he documented little about his alchemical work.
The demolition of Uraniborg scattered and destroyed most physical evidence. Yet sophisticated analytical techniques can extract chemical signatures from minute fragments, revealing practices invisible in written sources.
Unanswered Questions
Where tungsten fits into the cosmic correspondence system connecting planets, metals, and organs remains mysterious. Unlike the seven classical metals, tungsten had no recognized planetary association in Renaissance cosmology.
If Brahe knowingly used tungsten, he would have had to integrate it into a pre-existing symbolic framework—or recognize it as something fundamentally outside that system.
Rasmussen emphasized that other detected elements also require explanation. Nickel, zinc, tin, and lead appear in concentrations suggesting intentional use, yet none feature prominently in documented recipes.
"Something else must have happened in the alchemy lab," Rasmussen observed. The laboratory's true range of activities extended beyond the known Medicamenta Tria.
The research team has expressed interest in analyzing additional fragments from Uraniborg to uncover further insights. Hundreds of shards remain in Swedish museum collections, each potentially holding clues about Renaissance chemical practices.
A New Chapter in Chemical History
The tungsten finding does not definitively prove Brahe identified a new element—that achievement belongs to Scheele and the Elhuyar brothers in the 1780s.
However, it demonstrates that Renaissance alchemists encountered and possibly manipulated substances whose nature they could not fully understand.
This revelation complicates linear narratives of scientific progress. Rather than a straightforward march from ignorance to knowledge, the history of chemistry involves complex interactions between observation, theory, and technological capacity.
Brahe may have observed tungsten's properties without possessing the conceptual framework or experimental techniques to recognize it as an element distinct from other substances.
The discovery underscores alchemy's role as the predecessor of modern chemistry. Far from mere mystical pursuit of gold transmutation, alchemy involved systematic experimentation with materials, development of laboratory equipment and techniques, and accumulation of empirical knowledge about chemical transformations.
The analytical methods, apparatus, and observational practices developed by alchemists provided foundations for later chemical science.
Brahe himself exemplified this transitional moment. His astronomical observations, conducted with unprecedented precision using instruments of his own design, generated data that Johannes Kepler later used to formulate the laws of planetary motion—a cornerstone of modern physics.
His alchemical laboratory, equipped with state-of-the-art furnaces and distillation apparatus, represented the cutting edge of chemical investigation in the 1580s.
The presence of tungsten in artifacts from that laboratory suggests the boundary between pre-modern and modern science is more porous than traditionally understood. Renaissance investigators possessed greater empirical knowledge than credit allows, even when lacking theoretical frameworks to fully comprehend their observations.
The history of science emerges not as a simple replacement of error with truth, but as an ongoing negotiation between practice and understanding, observation and interpretation, data and theory.
