What Was Alchemy? History, Goals and Legacy

Alchemy was a pre-modern experimental tradition built around one question: how can materials be transformed? Its practitioners distilled, sublimed, dissolved and fused substances. They made pigments, acids and medicines, tried to turn base metals into gold, and tried to work out what matter is made of.^2,5

So the short answer to what alchemists were trying to do is this: make useful substances, make medicines, make gold, and understand matter along the way.

Historians now treat this work as part of chemistry's early history, not as a detour from it. They also avoid the modern split between "alchemy" and "chemistry." Until about 1700 the two words were used largely interchangeably. Lawrence Principe and William Newman use the older spelling chymistry for the undivided field. That way, seventeenth-century practitioners are not sorted into categories they would not have recognised.¹

Where the word and the practice came from

"Alchemy" reaches English through Arabic al-kīmiyā. Its deeper origin is uncertain. The candidates include an Egyptian word for black, which also referred to Egypt itself, and a Syriac form of the Greek khumeia, the art of melting and alloying metals.³

In Arabic texts, al-kīmiyā did not name a discipline. It named the substance that transmutes base metals into noble ones, and it was used as a synonym of al-iksīr: the elixir. Several laboratory words came into English along the same route, including elixir, alembic and alcohol.³

What alchemists were trying to accomplish

The aims depended on who was working, and when. Graeco-Egyptian writers described "ennobling" base metals into gold.⁶ The Book of the Balance, attributed to Jabir ibn Hayyan, sets out a double aim: transmuting bodies in the laboratory and transforming the practitioner's own soul.³ That second aim is the historical sense of "enlightenment" in this article's title.

Metallic transmutation was not an arbitrary fantasy. Suppose metals are not elements but compounds of the same basic ingredients, in different proportions and degrees of purity. Then converting one into another should be possible in principle. Observation seemed to agree. Lead ores almost always contain some silver, and silver ores some gold, as though the baser metals were slowly maturing into better ones.¹

The "three goals of alchemy"

Popular summaries often describe three goals of alchemy. Historians organise the historical practice somewhat differently. The Chymistry of Isaac Newton project at Indiana University describes early modern chymistry as three overlapping domains:²

Chemical technologies: making pigments and dyes, manufacturing mineral acids, and distilling strong spirits.
Medicines: chymical medicine, or iatrochemistry, one of the important new fields of early modern science.
Chrysopoeia: the attempt to make gold from less precious materials, which remained "a seemingly viable research project for many seventeenth century chymists."

The Science History Institute adds a further thread: alchemy as the study of how the natural world works, alongside its medical and experimental work.⁵ Treat any tidy list of "the three goals" as a modern summary, not a charter the alchemists agreed on.

Egyptian and Hellenistic beginnings

Some of the earliest surviving alchemical writing comes from Graeco-Roman Egypt. Craftspeople there had already developed advanced practical knowledge of pharmacology and of working metal, stone and glass.³

The best-known author of the period is Zosimos of Panopolis, whom Britannica places around the end of the Hellenistic era. He is one of about 40 authors preserved in a compendium of alchemical writings, probably assembled in Byzantium in the seventh or eighth century. Zosimos described ennobling metals by "killing and resurrecting" them through distillation and sublimation. He called the agent that could bring about transformation instantly "the tincture," or "the philosopher's stone."⁶ The vocabulary is strange, but the operations are still taught to chemistry students.

Arabic alchemy and the Jabirian corpus

After the seventh-century expansion brought Arabic-speaking scholars into contact with Egyptian traditions, Greek and Coptic alchemical texts were translated into Arabic. By the later eighth century, a very large body of writing had gathered under the name of Jabir ibn Hayyan, remembered by tradition as court alchemist to the Abbasid caliph Harun al-Rashid.³

More than 300 books carry his name. Partly for that reason, some scholars read the Corpus Jabirianum as the work of a group of anonymous authors rather than one person.³

The physician al-Razi, who later headed the Baghdad hospital, wrote in a plainer style. His description of a working laboratory reads like a stockroom inventory:³

furnace and bellows
crucibles, tweezers, hammer and file
cucurbit, alembic and receiving flask
named procedures for grinding, dissolving, solidifying, fusing and distilling

Whatever else the tradition believed, these texts document equipment and procedure systematically: distillation, filtration and fusion, written down as repeatable operations.

European chymistry

Arabic alchemical works were translated into Latin regularly from the first half of the twelfth century. By the early thirteenth century, Latin authors had absorbed that knowledge. Renaissance writers later tended to trace their tradition straight back to the Greeks, skipping the Islamic world that had carried it.³

The practical side shows clearly in print. Hieronymus Brunschwig's Liber de arte distillandi de compositis (Strasbourg, 1512), an illustrated manual of distillation apparatus and technique, is described by the Science History Institute as one of the earliest known printed books on chemistry and chemical technology in the Western world.⁹

Much alchemical writing stayed deliberately coded. Practitioners protected trade secrets, whether the product was a pigment, a medicine or the philosophers' stone, by writing processes as allegory: fiery dragons, green lions, chaos.^8,2 Historians have spent years decoding such texts. Some, notably Lawrence Principe, now reproduce the procedures at the bench to see what they actually describe.⁸

Boyle and Newton

Robert Boyle (1627–1691) is often cast as the man who ended alchemy. The record is more interesting. His The Sceptical Chymist (1661) argued against older theories of matter and defined elements as "certain primitive and simple, or perfectly unmingled bodies."⁴ Yet Boyle:⁴

practised alchemy throughout his life;
believed he had witnessed a transmutation;
successfully lobbied Parliament to repeal England's ban on transmutation.

The same man helped found the Royal Society around 1660, and his air-pump work gave us the pressure–volume relationship published in 1662 and now called Boyle's law.⁴

Isaac Newton is the more surprising case. He wrote and transcribed about a million words on alchemy, only a small fraction of which has ever been published.²

After his death in 1727, the papers were judged "not fit to be printed." They became widely known only in 1936, when Sotheby's catalogued 329 lots of his manuscripts, more than a third of them alchemical.²

His laboratory notebooks mix the two worlds. The notebook that first fully describes his discovery that white light is a mixture of spectral colours also contains recipes drawn from alchemical sources.²

What alchemy gave the laboratory

The Science History Institute calls the age of alchemy "an era of experimental discovery and practical skill."⁵ The lasting contributions were largely practical:

Apparatus: furnaces, crucibles, alembics and receivers, named and described in detail.³ For how laboratory vessels reached their modern forms, see our history of chemistry glassware.
Operations: distillation, sublimation, dissolution and fusion, carried out repeatedly and written down.^3,6
Products: mineral acids, pigments and medicines made to recipe.²
Vocabulary: words like alembic, alcohol and elixir.³

When alchemy and chemistry separated

The familiar story says chemists abandoned transmutation once new knowledge proved it impossible. Principe's archival work in Paris tells a different one.¹

At the Académie Royale des Sciences, transmutation research was forbidden at least three times — in 1666, 1685 and the early 1690s. The bans came from political administrators and finally Louis XIV himself, who did not want it thought that his money came from gold-making.

In the early eighteenth century, the Académie's secretary Fontenelle cast transmutation as futile and dishonest. Principe found no evidence-based refutation of it in the Académie's records. When Étienne-François Geoffroy exposed fraudulent transmutations in 1722, he stopped short of calling transmutation impossible. And according to Principe, virtually every Académie chemist went on pursuing or defending it until the 1770s. Some explained it with the newest theory available, phlogiston.¹

The two fields kept circling back to each other:¹

1817: William Prout proposed that all elements might be condensations of hydrogen.
Mid-nineteenth century: discoveries such as isomerism led chemists including Jean-Baptiste Dumas to consider whether metals were compounds after all. This was the same period in which structural theory was reshaping organic chemistry.
1901: Frederick Soddy and Ernest Rutherford found that thorium spontaneously turns into other elements. Soddy called it transmutation. Rutherford urged him not to, for fear they would be taken for alchemists.

Radioactivity and the nuclear atom that followed finally gave transmutation a real mechanism. That mechanism is nuclear, not chemical; for how that picture of the atom took shape, see the historical development of the atomic model.

Lead into gold, at CERN

In May 2025, CERN reported that the ALICE experiment at the Large Hadron Collider had measured lead being converted into gold.⁷

It happens when lead nuclei pass very close to one another without colliding. Their intense electromagnetic fields can knock protons and neutrons out of a nucleus. Lead has 82 protons and gold has 79, so a lead nucleus that loses three protons becomes gold.⁷

The quantities are tiny:⁷

Rate: at its peak, about 89,000 gold nuclei per second at the ALICE collision point.
Run 2 (2015–2018): about 86 billion gold nuclei across the four major experiments, roughly 29 picograms in total.
Lifetime: each gold nucleus fragments almost immediately against the beam pipe or collimators downstream, existing for a tiny fraction of a second.

This does not show that the alchemists were right. The distinction is the whole point:

Chemical transmutation cannot change an element into another. Chemical reactions rearrange electrons and bonds. They never change the number of protons in a nucleus, and that number is what defines an element. In CERN's words, "chemical methods are powerless to transmute one into the other."⁷
Nuclear transmutation can. Radioactive decay, bombardment, or electromagnetic dissociation in an accelerator can alter the proton number, and with it the element.

The alchemists' furnaces could never reach that level of matter.

What chemistry inherited

Chemistry did not inherit the philosophers' stone. It inherited a workshop:

apparatus refined over centuries of heating, distilling and separating;
operations that are still standard;
a written record of recipes and results, even when coded;
a long habit of treating matter as something method can transform.

It also inherited a lesson about how science changes. The line between alchemy and chemistry was drawn as much by institutions and reputation as by experiment, and it was redrawn more than once as new theories reopened old questions.¹

Sources

Lawrence M. Principe, Breaking Up and Making Up (Again and Again): Alchemy and Chemistry, 21st Dibner Library Lecture, Smithsonian Libraries, 11 December 2014.
The Chymistry of Isaac Newton Project (dir. William R. Newman), Indiana University, "Newton and Alchemy."
Gabriele Ferrario, "Al-Kimiya: Notes on Arabic Alchemy," Science History Institute, 16 October 2007.
Science History Institute, "Robert Boyle."
Science History Institute, Age of Alchemy (exhibition).
Encyclopaedia Britannica, "Zosimos of Panopolis."
CERN, "ALICE detects the conversion of lead into gold at the LHC," 8 May 2025. Research paper: ALICE Collaboration, Physical Review C 111, 054906 (2025).
Michal Meyer, "The Language of Alchemy," Distillations, Science History Institute, 14 November 2016.
Science History Institute Digital Collections, Hieronymus Brunschwig, Liber de arte distillandi de compositis (Strasbourg, 1512).

Image credit: Distillation furnace with conical still-heads and glass receiving flasks, from Hieronymus Brunschwig, Liber de arte distillandi de compositis (Strasbourg, 1512), image 37 of the digitised volume. Public Domain Mark 1.0. Courtesy of Science History Institute.