Transmutation: The Quest to Transform Matter in Alchemy

On 14 February 1980, a team at the Lawrence Berkeley National Laboratory under the direction of Glenn T. Seaborg, who already had a Nobel Prize to his name, transmuted a measurable quantity of bismuth-209 into gold by neutron capture. The yield was small — a few atoms at a time — and the cost of the gold was astronomical, but the transmutation was real, and the alchemists’ central ambition, ridiculed for two centuries, was at last technically demonstrated. It is one of the more satisfying results in the history of science, and it makes a useful place to begin. The alchemists wanted to transmute base metals into gold. The transmutation is physically possible. It is also, as the alchemists would have been the first to admit, useless. The alchemists’ mistake was not in thinking transmutation possible; it was in thinking it cheap, scalable, and a path to wealth. The mistake is a useful reminder that a correct theoretical claim can be married to a useless practical program, and that the marriage is a feature of how the modern history of science has been written, not a feature of the alchemists themselves.

Transmutation — the conversion of base metals into gold, or of one substance into another fundamentally different substance — is the most famous ambition of the alchemical tradition. For more than two thousand years, alchemists in Egypt, China, India, the Islamic world, and Latin Europe pursued the philosopher’s stone that they believed could accomplish this transformation. Their program was, in its own terms, a science; in ours, it is a chapter in the history of science, an enduring symbol of human ambition, and a body of practical knowledge that contributed to the development of metallurgy, chemistry, and materials science.

This pillar page is the entry point to the site’s treatment of transmutation. It complements the alchemy overview, the chronological account in history of alchemy, the biographical survey of famous alchemists, the systematic treatment of alchemical symbols, and the cultural history of the philosopher’s stone that is the agent of the transmutational work.

What transmutation meant

To a medieval alchemist, “transmutation” did not mean what it means to a modern physicist. The alchemist did not believe that a piece of lead could be made into a piece of gold by rearranging the atoms; the atomic theory was not yet part of the working framework. The alchemist believed that lead and gold were made of the same basic material in different states of perfection, and that the right process could complete the maturation that nature had left unfinished.

The word transmutation in Latin literally means “change across” — the movement of a substance from one state of being to another. The alchemists inherited the Aristotelian doctrine of the four elements, refined it through the tria prima of Jabir ibn Hayyan, and built a system in which every observable substance was a compound of the elements and the principles in some particular ratio. Two substances were different in kind if and only if their underlying compositions were different in kind. Since all metals were made of the same principles in different proportions, they were the same in kind. The argument is not crazy, and it took about two thousand years to be definitively refuted.

This is the conceptual foundation of the transmutational program. If two substances differ only in the ratio of the principles, then in principle the ratio can be changed. The alchemist’s task is to find the active agent — the philosopher’s stone, the elixir, the ferment, the tincture — that can effect the change. The active agent is itself a kind of transmuted substance: it is the equilibrium point of the principles, the state at which a small amount of the agent can tip a large mass of base matter into the same equilibrium. The logic is elegant; the chemistry is wrong; the program produced, as a side effect, two thousand years of metallurgical observation and a large fraction of the apparatus of modern chemistry.

The theoretical basis

Four conceptual claims, taken together, constitute the theoretical foundation of transmutational alchemy. None of them is “wrong” in the sense the modern reader expects, and a serious treatment of the program has to take all four seriously.

The unity of matter

The doctrine of the unity of matter is the deepest of the four. It holds that there is a single underlying substance, the prima materia, from which all things are made and to which all things can be reduced. The prima materia is not itself a substance in the ordinary sense; it has no qualities of its own, since the qualities are conferred on it by the elements and principles that combine in it. The prima materia is what remains when everything else has been removed.

The doctrine has a long pedigree. Aristotle had taught that the four elements were all transformations of a single underlying matter; the Stoics had taught that the cosmos was a single living substance; the Hermetic tradition had taught that the cosmos was animated by a single spirit. The alchemists inherited all of these and added the practical claim that the prima materia could be identified in the laboratory and used as the starting point of the work. The Stoic-Hermetic lineage is, in my view, the deepest intellectual ancestry of the transmutational program, and the lineage is what makes the program a piece of natural philosophy and not just a craft.

The transmutability of metals

The alchemists believed that all metals were made of the same principles in different proportions. Lead is a base metal because it contains an excess of the impure and the cold; gold is a noble metal because its principles are perfectly balanced and harmonized. The differences between metals are therefore not absolute. A base metal can be made noble by removing the impurities and bringing the principles into balance.

The doctrine was first articulated in the Hellenistic period, in the pseudo-Democritean corpus and in the works of Zosimos of Panopolis. It was systematized in the Arabic tradition, especially by Jabir ibn Hayyan, and it became a standard part of Latin medieval and early modern alchemical theory. The doctrine was held by some of the most rigorous natural philosophers of the period, including Roger Bacon, Albertus Magnus, and Isaac Newton (Newman, Promethean Ambitions, 2004, pp. 67–112). The fact that the doctrine was held by such minds is the strongest possible argument against the dismissive reading of alchemy.

The maturation of metals in the earth

The alchemists believed that metals grow in the earth, just as plants grow on the surface. A vein of lead ore is the seed of the metal, planted in the appropriate matrix of earth and water; over time, under the influence of the celestial heat, the seed matures into a fully formed metal. The slowest and most deeply buried veins have not yet completed their maturation; the most exposed and best-formed veins have matured completely into gold.

This doctrine gave the alchemists their basic program. If metals grow in the earth, then the work of the alchemist is to accelerate and complete the natural process. The alchemist provides the right kind of heat, the right kind of vessel, and the right kind of ferment, and the seed of the base metal is matured into the noble metal in weeks or months instead of centuries. The earliest extant statement of the doctrine is the pseudo-Democritean Physica et Mystica (1st–3rd c. CE). The doctrine is, in the modern sense, false: metals do not grow. But the conceptual move — natural processes have rates that can be manipulated — is the conceptual foundation of catalysis, and the alchemists deserve credit for being there first.

The existence of a perfected agent

The final claim is the existence of a perfected agent — the philosopher’s stone or the elixir — that can effect the transmutation. The agent is itself a product of the alchemical work, prepared by the multi-stage process that the tradition calls the magnum opus. Once prepared, the agent can be “projected” onto a base metal, usually in a small quantity, to convert a much larger quantity into gold. The alchemists compared the action of the stone to that of a ferment in bread: a small amount of leaven converts a much larger mass of dough. The ferment metaphor is the right one. A modern catalyst is also a small amount of an agent that produces a much larger transformation. The alchemists’ mistake was in imagining the catalyst as a metaphysical substance rather than a chemical one; the structural insight was correct.

The practical program

The alchemical literature describes a vast number of specific procedures for the transmutational work. The procedures are highly varied, and many of them are deliberately obscure. The alchemists used coded language, allegorical images, and sometimes outright false recipes to protect their secrets. The procedures that can be reconstructed from the historical record fall into several broad categories.

Metallurgical transmutation

The most straightforward alchemical procedures involved the apparent transmutation of one metal into another by means of alloys, surface treatments, and the use of reagents to alter the appearance of a base metal. A piece of lead could be made to look like gold by cupellation, by treatment with sulfur or antimony, or by the application of a colored varnish. The alchemists knew perfectly well that these procedures did not produce real gold; they called the product “imitation” or “fool’s gold.” But the existence of imitation gold was taken as evidence that real transmutation was in principle possible. The argument is shakier than the alchemists thought, but the existence of imitation gold is also the foundation of the entire history of metallurgy, and the modern reader should not dismiss the work too quickly.

Chrysopoeic transmutation

The serious transmutational program, called chrysopoeia (“gold-making”), aimed at the production of real gold by the projection of the philosopher’s stone. The procedures described in the literature are elaborate and require a long apprenticeship. The standard account, drawing on the work of Zosimos of Panopolis and his successors, is the magnum opus, the great work, divided into four color stages and culminating in the production of the red stone. The standard apparatus of the magnum opus includes the vas (philosophical egg, a sealed glass vessel), the athanor (a self-feeding furnace designed to maintain a steady temperature over weeks or months), the circulatorium (a digestion vessel), and the pelican (a circulating distillation vessel). On these, see Principe, The Secrets of Alchemy (2013), pp. 51–89.

Medicinal transmutation

The Paracelsian tradition extended the concept of transmutation to medicine. Diseases were the result of imbalances in the tria prima of the body, and the proper remedies were purified mineral and metallic preparations that could correct the imbalances. The alchemist was, in this tradition, a physician, and the laboratory was an extension of the pharmacy. The spagyric alchemy cluster examines this dimension of the work, and the medicinal branch is, in practical terms, the most important legacy of the transmutational program. The pharmaceutical industry of the twentieth century inherited a great deal more from the spagyric laboratory than it admits.

Spiritual transmutation

In the inner or Hermetic tradition, transmutation was an allegory for the transformation of the soul. The lead of the base self is to be worked upon by the operations of the spiritual life, and the philosopher’s stone is the integrated self that emerges from the work. The alchemical texts in this register are often indistinguishable from devotional literature, and they are the principal source of the modern psychological reading of alchemy.

The great work in detail

The detailed program of transmutational alchemy is the magnum opus, the “great work.” The opus is divided into four stages marked by color changes, and each stage involves its own operations and its own pitfalls. The full treatment is in the magnum opus cluster; a brief summary follows.

The first stage is the nigredo, the blackening. The starting material is identified and broken down; the prima materia is dissolved and putrefied into a black mass that looks like a failure. The death of the old form is the necessary beginning of the work, and the apparent uselessness of the blackened matter is part of the alchemist’s discipline to accept.

The second stage is the albedo, the whitening. The dissolved matter is purified and brought to a state of balance. The product of this stage is sometimes called the “white stone” or the “white elixir,” and it is thought to be capable of transmuting base metals into silver. The white stone is a major goal of the alchemical work, and some alchemists stopped here.

The third stage is the citrinitas, the yellowing, an optional transitional stage in which the matter takes on a pale yellow color associated with the dawn and with the planet Mercury. The citrinitas is a later addition to the Hellenistic scheme, first articulated systematically in the Rosarium philosophorum (c. 1550).

The fourth stage is the rubedo, the reddening. The matter is brought to its final perfection as the red stone, the philosopher’s stone itself — the agent through which base metals are converted into gold and, in the medical tradition, all diseases are cured and life prolonged.

Famous claims of transmutation

The alchemical literature is full of claims that the transmutation has actually been accomplished. The most famous are listed below.

The legendary philosopher’s stone of Nicolas Flamel, the Parisian scrivener who, according to the legend, succeeded in 1382 and used the stone to fund charitable works.
The transmutation reportedly performed before Emperor Leopold I by the Prague goldsmith Wenzel Seiler in 1675, reported in a letter by the polymath Andreas Tentzel (Principe, The Secrets of Alchemy, 2013, p. 175; Principe & DeWitt, Transmutations: Alchemy in Art, 2002).
The most thoroughly documented early modern case is the alleged transmutation witnessed by Johannes van Helmont, the Flemish chemist, in 1618. Van Helmont reported that a small piece of the philosopher’s stone, given to him by an unnamed stranger, converted a quantity of mercury into gold that he himself assayed and confirmed. Van Helmont’s case is the most credible of the early modern transmutation claims, though it has been debated for centuries.

Whether any of these claims is literally true is doubtful. The case of Nicolas Flamel is legend rather than history. The case of van Helmont, though well-documented, rests on the testimony of a single witness and on the assay of a single piece of gold. Modern readers can take these claims as evidence of the seriousness with which the transmutational project was pursued, rather than as evidence of its success. A serious history of the program has to take the claims seriously as documents of belief even when it cannot take them as records of fact.

The decline of transmutation

The transmutational program came under sustained attack in the seventeenth and eighteenth centuries. The mechanical philosophy of Descartes, Hobbes, and others argued that all natural phenomena could be explained by matter and motion, and that the qualitative transformations described by the alchemists were artifacts of an obsolete Aristotelian framework. Robert Boyle’s Sceptical Chymist (1661) argued against the tria prima and the four elements as irreducible constituents; the Sceptical Chymist was the work of an alchemist attacking other alchemists’ theories, not a wholesale rejection of alchemy as such (Principe, The Secrets of Alchemy, 2013, pp. 195–211). Lavoisier’s Traité Élémentaire de Chimie (1789) redefined chemistry as the science of elements in the modern sense and explicitly excluded transmutational aims.

By the early nineteenth century, the transmutational program was generally regarded as a failure and alchemy itself as a chapter in the history of mistaken ideas. The modern consensus was that alchemists had been deceived by their own theoretical framework, and that the transmutational program had produced no useful results. The consensus is partly correct; the consensus also has a polemical function, since it let the founders of the new chemistry distance themselves from the tradition they had actually grown out of.

The reassessment of the modern era

The modern reassessment of alchemy began with the recovery of Isaac Newton’s alchemical manuscripts in 1936, which made it impossible to dismiss alchemy as the activity of cranks and frauds. The publication of Newton’s alchemical writings showed that the most rigorous natural philosopher of the early Enlightenment had taken alchemy seriously, and the subsequent recovery of Boyle’s, Locke’s, and Leibniz’s alchemical papers showed that the tradition was central to the work of the founding generation of modern science.

The reassessment has several components. First, historians of science now recognize that alchemy contributed substantially to the development of laboratory techniques, apparatus, and experimental methods. Second, they recognize that the alchemical theory of matter, though wrong in its details, was a serious attempt to understand the composition and transformation of substances, and that the attempts to refute it played an important role in the development of modern chemistry. Third, the cultural and symbolic dimensions of the tradition have been taken seriously by historians of religion, art, and literature. On the twentieth-century historiographical recovery of the alchemical tradition, see Principe, The Secrets of Alchemy (2013), pp. 215–238.

Transmutation in modern thought

The alchemical concept of transmutation continues to inform several areas of modern thought, even where the literal alchemical program has been abandoned.

In nuclear physics, the literal transmutation of one element into another is a routine laboratory procedure. Modern nuclear physics has, in fact, transmuted other elements into gold. In 1980 Glenn Seaborg’s group at Berkeley transmuted bismuth-209 into gold by neutron capture, and earlier nuclear work had produced gold from mercury and from platinum; the cost is, of course, astronomical. The alchemists’ dream of cheap gold from lead is, however, still beyond reach (Principe, The Secrets of Alchemy, 2013, p. 195). The Seaborg transmutation is the most striking vindication of the alchemical theoretical claim and the most striking refutation of the alchemical practical program, and a reader who knows both halves of the story has a much better grip on the relation of alchemy to modern chemistry than a reader who knows only one.

In psychology, the alchemical concept of the transformation of the self has been a central theme of the Jungian tradition. The magnum opus is, on the Jungian reading, a symbolic map of the process of psychic integration. The lead of the unconscious is to be worked upon by the operations of the analytical method, and the gold that emerges is the integrated self.

In popular culture, the transmutational program retains its grip. The philosopher’s stone is the MacGuffin of the Harry Potter series. The anime and manga Fullmetal Alchemist is built around the principle of equivalent exchange. The language of transmutation — purification, transformation, integration — is the working vocabulary of much self-help literature.

Transmutation in comparative perspective

The Western alchemical program of transmutation is one of the most fully developed in the world’s alchemical traditions, but it is not the only one. The Chinese, Indian, and Islamic alchemical traditions all developed their own programs of transmutation, and the comparison of the programs is a useful exercise in the comparative study of alchemy.

The Chinese alchemical tradition developed the program of waidan (external alchemy), which sought the elixir of immortality through the preparation of mineral and metallic drugs, particularly compounds of mercury, cinnabar, lead, gold, and jade. The waidan tradition was particularly focused on cinnabar and lead in the early Tang, with gold and jade becoming more prominent in later periods. The external alchemical program was closely related to the program of transmutation, and the external alchemists often sought both the elixir of immortality and the production of gold. The Chinese program is treated in detail in the cluster on Chinese alchemy.

The Indian alchemical tradition, in the form of rasa-śāstra (the “science of mercury”) and the rasāyana tradition, developed a sophisticated theoretical framework centered on mercury (parāda) as the supreme reagent, with sulfur (gandhaka) and a series of mineral and plant uparasas (auxiliary reagents). The Indian alchemists sought both the elixir of longevity (deha-rasāyana) and the perfection of the body through alchemical means. Dhātuvāda, the transmutation of metals, was a related but secondary program. The Indian tradition is treated in detail in the cluster on Indian alchemy; for the Sanskrit-textual tradition, see Wujastyk, The Roots of Ayurveda (1998), and Meulenbeld, A History of Indian Medical Literature (1999–2002).

The Islamic alchemical tradition developed a sophisticated program of transmutation that was inherited from the Greek sources and developed by the major figures of the Arabic alchemical tradition. The Islamic program was particularly important in the transmission of the Greek alchemical inheritance to the Latin West, and the Arabic texts on transmutation were translated into Latin in the twelfth and thirteenth centuries. The Islamic program is treated in detail in the cluster on Islamic alchemy.

The three programs share a common structure: the conviction that the metals are composed of the same underlying principles, the conviction that the differences among metals are differences of balance, and the conviction that the alchemist can adjust the balance to produce the transmutation. The three programs differ in detail — the specific substances, the specific operations, the specific symbolic vocabulary — but the underlying conviction is the same.

Transmutation and the philosophy of science

The alchemical program of transmutation is a productive case study for the philosophy of science, because it shows the full life-cycle of a theoretical claim from birth to falsification to vindication under a new framework. The alchemists’ theory of the unity of matter predicted that transmutation was possible; the modern chemical theory of the elements predicted that transmutation was impossible within the limits of chemical reactions; the modern nuclear theory predicted that transmutation was possible within the limits of nuclear reactions. All three theories were testable, and all three have been tested. The alchemists’ theory was wrong as a description of chemical reality but right as a description of nuclear reality, and the wrongness of the chemical prediction and the rightness of the nuclear prediction are both facts that the philosophy of science has to account for. The transmutational program is one of the clearest historical examples of a theory that was wrong in its specific claims but generative in its research program. It is also one of the most productive single cases in the historiography of science for thinking about the relationship between theoretical framework, experimental practice, and long-term disciplinary change, and any working philosopher of science who does not know the alchemical material is missing a major source of cases.