The Bizarre Chemical Process Used to Turn Mummies Into Paint

When an observer stands before a nineteenth-century oil painting, the immediate interaction is visual and emotional. The mind processes light, shadow, composition, and narrative. Yet, beneath the varnish and the linseed oil lies a stark material reality: a painting is a physical record of global supply chains, chemical extraction, and, in some historical instances, profound ethical transgressions.

The history of art materials is often romanticized as a pursuit of pure aesthetic beauty. The reality is far more visceral. Among the most disturbing materials ever to grace the palettes of European masters is a pigment known as Caput Mortuum, Egyptian Brown, or, most commonly, Mummy Brown. Between the sixteenth and twentieth centuries, European artists actively utilized a pigment manufactured by grinding up the preserved remains of ancient humans and felines.

By analyzing the application, discovery, and eventual obsolescence of Mummy Brown through specific historical case studies, we uncover a complex narrative about material culture. The life cycle of this pigment exposes the mechanisms of colonial extraction, the psychological disconnect between artists and their supplies, and the evolving ethics of conservation science.

The Chemistry of Exhumation

To understand how a human corpse transitions into a commercially available art supply, one must examine the specific chemical profile that made Mummy Brown so desirable to painters.

The pigment was not simply bone dust or dried flesh. The manufacturing process required a precise amalgamation of materials found within ancient Egyptian burial practices, combined with European additives. The base material consisted of pulverized human and animal mummies, which were mixed with white pitch—a reddish-brown resin known today as Burgundy pitch, extracted from the Norwegian spruce. To this base, manufacturers added myrrh and, crucially, natural asphaltum or bitumen.

Ancient Egyptian embalmers frequently utilized bitumen, a highly viscous petroleum derivative, to fill the cranial and abdominal cavities of the deceased after the organs were removed. Over millennia, this bitumen bonded with the desiccated human tissue, the linen wrappings, and the naturally occurring minerals in the arid tomb environment. When European pigment manufacturers, known as "colourmen," pulverized these remains, they inadvertently created a complex organic and inorganic matrix.

The resulting oil paint possessed physical properties that contemporary synthetic alternatives struggled to replicate. Mummy Brown occupied a unique chromatic space on the artist's palette, sitting delicately between the slightly greenish tint of raw umber and the ruddy, oxidized warmth of burnt umber.

Painters prized the pigment for its exceptional transparency. When suspended in oil, it allowed light to penetrate the pigment layer and reflect off the white gesso ground below. This made it an unparalleled medium for glazing—the technique of applying thin, transparent layers of paint to build up luminous shadows and deep, resonant midtones. Ironically, artists frequently utilized the ground remains of the dead to achieve the most lifelike flesh tones in their portraits, relying on the pigment's smooth consistency and durable, varnish-like finish.

Case Study I: The Royal Remains and Martin Drolling’s Subversive Kitchen

The most extreme manifestation of this practice occurred not with ancient Egyptian remains, but with the desecration of European royalty during a period of intense political upheaval.

In the Louvre Museum hangs a modest genre painting by Martin Drolling titled L'Intérieur d'une cuisine (Interior of a Kitchen), completed in 1815. At a glance, the 65 by 80.8-centimeter canvas is a quiet, bourgeois domestic scene. Two women sit engaged in needlework, surrounded by copper pots and earthenware, while a child plays with a cat near an open window. The lighting is soft, the shadows are deep, and the atmosphere is steeped in the tranquil tradition of Dutch genre painting.

The material reality of the canvas tells a violently different story. The rich, luminous brown glazes that define the shadows of the kitchen and the architecture of the room are widely believed to have been painted using the pulverized hearts of French monarchs.

During the height of the French Revolution in 1793, the revolutionary government ordered the destruction of the royal tombs at the Basilica of Saint-Denis to extract lead for munitions and to symbolically dismantle the legacy of the monarchy. The architect Louis-François Petit-Radel was tasked with overseeing the exhumation of forty-five royal hearts, including those of Louis XIII and Louis XIV.

Rather than destroying the remains, Petit-Radel recognized their material value. The royal hearts had been embalmed and preserved using a complex mixture of herbs, resins, and aromatics, resulting in a hardened, coagulated mass similar to the bitumen-soaked Egyptian mummies. Petit-Radel sold a dozen of these mummified hearts to a select group of painters, including Martin Drolling, who functioned as an assistant to Élisabeth Vigée Le Brun before ascending to lead the Manufacture nationale de Sèvres.

Drolling took the hearts of the absolute monarchs who had once built the Palace of Versailles, boiled them down, and ground them into his own proprietary variation of Mummy Brown. He then applied this royal pigment to a canvas depicting the absolute mundane: a peasant kitchen.

Principles Extracted: The Political Alchemy of Materials

Drolling’s L'Intérieur d'une cuisine provides a profound lesson in the semiotics of artistic materials. When the literal substance of a painting carries its own historical weight, the medium subverts the message.

In this case study, we witness the ultimate democratization and degradation of absolute power. The physical bodies of Louis XIII and Louis XIV, men who claimed a divine right to rule, were commodified, reduced to a raw chemical paste, and used to render the shadows of a common cooking pot. The transition of the royal body into an artist's glaze illustrates how political regimes do not merely destroy their predecessors; they physically consume and repurpose them.

The painting forces art historians to evaluate artworks not just as visual texts, but as forensic sites of political history. The use of royal mummies for paint transforms a serene 1815 domestic scene into an enduring, radical act of class inversion, embedded invisibly within the molecular structure of the canvas.

Case Study II: Edward Burne-Jones and the Crisis of Origins

While Martin Drolling actively procured and processed human remains with full knowledge of their origin, the majority of nineteenth-century artists operated in a state of deliberate or accidental ignorance. The commercialization of art supplies had created a buffer between the artist and the raw materials they consumed. The breaking of this buffer offers a compelling study of ethical awakening.

Edward Burne-Jones was a central figure in the Pre-Raphaelite Brotherhood, a group of English painters who sought to return to the abundant detail, intense colors, and complex compositions of Quattrocento Italian art. The Pre-Raphaelites were heavily reliant on transparent glazes to achieve their signature luminous effects, making Mummy Brown an attractive staple on their palettes.

Burne-Jones had utilized the pigment extensively, operating under the assumption that the name "Mummy Brown" was a fanciful marketing term—a poetic designation meant to evoke the arid warmth of the Egyptian desert, much like "Elephant's Breath" or "Dragon's Blood" described other shades.

The illusion shattered during a visit from a fellow painter, Sir Lawrence Alma-Tadema. As recounted by Burne-Jones's wife, Georgiana, Alma-Tadema casually mentioned that he had recently visited the workshop of a prominent London colourman. There, he had witnessed a complete Egyptian mummy in the process of being dismantled and ground into powder.

Burne-Jones scornfully rejected the claim at first, insisting the name was merely descriptive. When Alma-Tadema confirmed the literal truth of the pigment's composition, the psychological impact on Burne-Jones was immediate and severe. He was utterly distressed to realize he had been actively smearing the remains of ancient humans across his canvases.

His nephew, the author Rudyard Kipling, happened to be present for the aftermath and documented the resulting event in his autobiographical writings. Kipling recalled Burne-Jones descending from his studio in broad daylight, clutching his only tube of Mummy Brown. The artist announced that he had discovered the paint was made of "dead Pharaohs" and declared that they must bury it accordingly.

The family proceeded to the garden, bored a hole into the green grass, and deposited the tube of paint into the earth. Kipling noted that they laid the pigment to rest "according to the rites of Mizraim and Memphis," and a young girl present planted a daisy root above the grave to mark the spot. Kipling later claimed he could drive a spade within a foot of the burial site even decades later.

Principles Extracted: The Psychology of the Supply Chain

The garden funeral of a paint tube reveals a fundamental vulnerability in consumer behavior: the alienation of the user from the source of their tools.

Burne-Jones's violent reaction underscores a psychological threshold. As long as the material was categorized merely as an industrial pigment, it was ethically neutral. The moment Alma-Tadema reintroduced the humanity of the raw material—transforming the paint back into a corpse—the object became a source of horror.

This case study highlights the inherent friction in Victorian colonial culture. The British Empire felt entitled to excavate, export, and consume the artifacts of conquered or occupied nations, viewing human remains as highly commodifiable resources. Mummies were shipped across the Mediterranean by the thousands, used for everything from theatrical unwrapping parties in medical theaters to fueling steam engines.

Burne-Jones’s burial of the pigment represents a rare, individualized moment of resistance against this systemic commodification. It forces modern consumers to question the hidden origins of their own materials. The supply chains of the nineteenth century obfuscated the grave-robbing required to produce a tube of paint, much as modern supply chains obscure the ecological and human costs of producing cobalt or synthetic dyes today.

The Analytical Challenge: Detecting the Dead in the Archives

The historical anecdotes of Drolling and Burne-Jones are well-documented, but proving the presence of Mummy Brown on specific canvases remains a severe technical challenge for modern conservation scientists.

At institutions like the Straus Center for Conservation and Technical Studies at the Harvard Art Museums, researchers actively investigate the historical use of pigments. The center houses the Forbes Pigment Collection, a renowned archive of rare and historical art materials, which includes authentic, early twentieth-century tubes of Mummy Brown manufactured by Charles Roberson and Co..

Narayan Khandekar, the director and senior conservation scientist at the Straus Center, has highlighted the difficulty of positively identifying the pigment on a finished canvas. Brown pigments are notoriously challenging to differentiate using standard non-destructive testing.

When conservators analyze a painting, they frequently rely on X-ray fluorescence (XRF). XRF blasts a small section of a canvas with X-rays, causing the elements in the paint to emit secondary fluorescent X-rays. By measuring the energy of these emissions, scientists can identify the specific elements present. This works exceptionally well for heavy metals; finding mercury indicates vermilion, while identifying arsenic points to Scheele’s green.

However, Mummy Brown is an organic compound. XRF struggles to detect light elements and is often confounded by the heavy lead carbonates present in the priming layers of nineteenth-century canvases. Furthermore, a standard chemical analysis of a brown patch on a canvas will reveal iron oxides and earth minerals, which are identical to those found in raw and burnt umber.

To definitively prove that mummies used for paint exist on a specific canvas—such as Eugène Delacroix's Liberty Leading the People, which is heavily rumored to feature the pigment—scientists must rely on mass spectrometry. This requires taking a physical, destructive core sample from the painting, a practice conservators are highly reluctant to perform on priceless masterpieces.

When mass spectrometry is utilized, researchers do not look for "humanity" in the paint. Instead, they look for specific chemical flags: animal and plant metabolites, the unique lipid profiles of human decay, and the presence of ancient natural asphalt. This meticulous forensic process demonstrates how the intersection of art and science is required to untangle the ethical knots left behind by previous centuries.

The Economics of Exhaustion: The End of the Mummia Trade

The demise of Mummy Brown was not driven primarily by a sudden, industry-wide ethical awakening. The end of the pigment was dictated by the harsh realities of supply and demand, coupled with changing aesthetic preferences and the physical exhaustion of the resource.

In the early eighteenth century, an artist supply shop in Paris cheekily named "À la momie" sold varnishes, powdered mummy, and incense. By the nineteenth century, large-scale London manufacturers like C. Roberson & Co. dominated the trade, providing the pigment to prominent artists across Europe.

However, by the late nineteenth and early twentieth centuries, several factors began to choke the supply chain. First, the supply of ancient Egyptian mummies was finite. After centuries of industrial-scale plundering for medicine, fuel, and pigment, complete, high-quality mummies became increasingly scarce and expensive. Scoundrels and forgers in the eighteenth and nineteenth centuries even began manufacturing fake mummies, wrapping fresh corpses of executed criminals in bitumen-soaked bandages and baking them in ovens to meet the commercial demand.

Second, the structural integrity of the paint itself came under scrutiny. Mummy Brown was what chemists and painters refer to as a "fugitive color". Due to the volatile organic compounds and the bitumen content, the pigment was highly unstable. It had a tendency to fade drastically when exposed to sunlight, and the bitumen could cause the paint layer to crack, blister, or refuse to dry entirely, ruining the surface of the canvas over time. Artists, seeking permanence in their work, grew frustrated with the material's unpredictable chemistry.

By 1915, the demand for the pigment had plummeted, though prominent colourmen continued to list it in their catalogs for decades, relying on stockpiled material.

The final, definitive conclusion to the commercial production of Mummy Brown occurred in 1964. Geoffrey Roberson-Park, the managing director of C. Roberson & Co., issued a statement to the press that effectively closed a centuries-old chapter of macabre art history. He regretfully informed the public that the firm had completely run out of mummies to grind up.

"We might have a few odd limbs lying around somewhere," Roberson-Park stated, "but not enough to make any more paint. We sold our last complete mummy some years ago for, I think, £3. Perhaps we shouldn't have. We certainly can't get any more".

This stark admission highlights the sheer banality with which human remains were treated by the industrial suppliers. A complete ancient human, preserved for eternity by a complex religious bureaucracy, was liquidated for three pounds sterling to create a fading brown glaze. Today, any tube of paint labeled "Mummy Brown" is synthesized entirely from inorganic earth substances, usually a mixture of kaolin, quartz, goethite, and hematite.

Broader Lessons: The Legacy of Material Extraction

The historical application of mummies used for paint provides a critical lens through which to evaluate our contemporary relationship with material culture and the ethics of creation.

The case studies of Martin Drolling and Edward Burne-Jones illustrate a spectrum of complicity. Drolling represents the intentional, politically motivated consumption of the dead, weaponizing the physical remains of the monarchy to craft a new aesthetic reality. Burne-Jones represents the insulated consumer, horrified when the veil of industrial processing is pulled back to reveal the morbid origin of a preferred product.

These narratives force a re-examination of how raw materials are procured. The nineteenth-century trade in Mummy Brown was predicated on a severe power imbalance. The British and French empires viewed the cultural heritage and the physical bodies of colonized or occupied territories as open quarries. The ancient Egyptians embalmed their dead to ensure their survival in the afterlife; Victorian London ground them into dust to shade the folds of a painted dress.

When we observe paintings from the Romantic and Pre-Raphaelite periods, we must acknowledge that the canvas is not merely a surface for an image, but a reliquary. The materials utilized by historical artists were intimately tied to the exploitation of environments and peoples. Recognizing this does not erase the aesthetic value of the artwork, but it demands a more rigorous, honest engagement with the physical cost of its creation.

The Lingering Stain on the Palette

The legacy of this peculiar pigment extends far beyond the chemical analysis of cracked oil paint on a museum wall. It challenges the fundamental assumption that art exists in a pure, elevated sphere, separated from the brutal economics of human history.

When we uncover the specific histories of materials—whether it is Tyrian purple extracted from tens of thousands of decaying mollusks, Indian yellow purportedly distilled from the urine of malnourished cows forced to eat mango leaves, or a rich brown shadow manufactured from the ribcage of an ancient priest—we are forced to confront the violent alchemy of human expression.

The next time you walk through the dimly lit corridors of a major gallery, closely observing the warm, resinous shadows of a nineteenth-century portrait, consider the physical weight of the medium. You are not simply looking at a masterclass in glazing techniques or a representation of history. You are, quite literally, looking at history itself, suspended in oil, staring back at you from the canvas.