How Exactly Is A Piece Of Art Faked?

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Forgers use chemistry, everyday items, and their artistic know-how to create forgeries that manage to fool even the experts.

In 2011, the world-renowned Knoedler & Company art gallery, New York had to shut down forever, locking behind its doors almost 165 years of art and history. What compelled them to take such a drastic step was a massive forgery lawsuit—a million-dollar lawsuit that shook the art market and artists around the world. The global art world is worth approximately 64 billion dollars and fake art makes up a significant part of that total.

Forgery is an unholy amalgamation of art and science. The forgers and the law enforcement agencies investigating them both depend on aspects of science as a tool. The former uses it to create a ruse, while the latter uses it to expose the deception. Onscreen characters like Neal Caffery (White Collar) or Harry Donovan (Incognito) might have given us a sneak peek into the complexities of art forgery, but in real life, it’s even more tedious. To make the art look real, the forger must perfectly embody the artist and his style. It’s like method acting of the painting world. 

With that exciting premise in mind, let’s uncover the secrets and science behind art forgery!

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The Provenance

Most forgers don’t attempt to copy an existing painting. They instead try to create work from the artist that never existed, but could have existed. The first step needed to fool the art dealer or the gallery is fabricating provenance. Provenance consists of documents that give information about the art’s chain of ownership. Forgers invent stories about dead relatives, forgotten heirlooms, or secret war loot finally discovered after decades or centuries.

Wolfgang Beltracci, a German forger (arrested in 2010) and his wife Helene shook the art world with their fake Jägers collection. He used old cameras and reels from the 1930s, creating photographs for provenance. Helena posed as her grandmother in period clothing, with the forgeries in the background. The pictures were made to look old and blurred enough to fool art experts. 

Also Read: What Is The Science Behind Detecting Art Forgery?

The Raw Materials

The next step involves procuring the raw materials for the painting, which includes: the stretcher/board, the surface, and the painting materials.

Talented Female Artist Works on Abstract Oil Painting, Using Paint Brush She Creates Modern Masterpiece(Gorodenkoff)s
(Photo Credit : Gorodenkoff/Shutterstock)

The Stretcher/Wood Board

The most common trick forgers use is buying old furniture and paintings from the original artist’s era. They use the old wood to make the stretcher. Or they use the Masonite board from an old cheaper painting that already has an old art dealer stamp. This not only makes the support look old and authentic, but sometimes helps them cheat the carbon dating test.

Iron nails are often used to attach the canvas to the stretcher. To make the nails rusty, forgers often use salt water to speed up the oxidation process of the nails to make them look old.

The Surface

Paper and canvas are the two favorite choices amongst forgers. Over the years, they have cracked the key to beat visual scrutiny, and sometimes even chemical analysis!

Paper: To fake older artists and beat the carbon dating test, the forgers must find paper that fits the era. They scavenge bookstores in search of old books. Since olden times, books have had one or two empty pages in the front or back. The forgers tear this papers and use them for drawing. Other forgers let the paper select the master. Whichever artist’s style fits the dimension of the paper gets used in that particular forgery.

Using paper from books does come with certain problems, one of them being bookworm holes (no, not human bookworms, actual bookworms). An old painting might develop wormholes with time, but the paint would already be dry when that happens, which means no paint beyond the edges.

However, if a forger paints over paper with wormholes, the ink/paint would seep through the hole to the back, which would immediately alarm an expert authenticating it. Master forger Eric Hebborn came up with a clever solution to keep the paint out of such wormholes.

He would patch the hole with some chewed paper, and trim the edges of the paper plug to perfectly fit the hole. He would then remove the plug after the paint was dry.

In his book “The Art Forger’s Handbook”, he also suggested using benzine (not benzene) to remove grease spots from paper, as well as using sliced potato or ammonia solution to prep the greasy surface of the paper before painting.

Forgers who work on mimicking artists closer to their times only have to make the paper look a few decades old. They come up with ingenious paper-aging techniques. Some use a permanganate solution to give the paper a yellowish tint or apply tea/ coffee to give it a light brownish tint.

Tom Keating, a fraudster who created many fake watercolor paintings, had a very theatrical technique of creating rusty-looking spots (foxing) on the paper. Before his painting went completely dry, he would flick a little bit of coffee powder into the air. As the dust fell, it would magically create rust spots on the paper.

A 16th-century author, Giorgio Vasari, in his book Lives of Artists, writes about Michelangelo using smoky fire and tea to tint his papers before forgery. Yes, we’re talking about the “Michelangelo”, who was a forger at the beginning of his career!

Albumen Back card from J. Holtzweissig with foxing
Foxing on paper (Photo Credit : Mauro J. Mazzini/Wikimedia Commons)

Even David Stein, who was arrested in 1969 for forging Picasso and Chagall, soaked his paper in tea to taint them.

For canvas, forgers buy old paintings of less famous artists. They scrape off the paint using a paint stripper or undiluted acetone. If using newer canvases, they bleach the canvas to make it look more worn out and stain them with tea/chicory to achieve the desired rustic color.

The Painting Materials

Many old masters (European artists who worked before the 1800s) used ink for painting. Eric Hebborn used old apothecary (medieval pharmacies) recipes to make their inks to match the chemical composition using ingredients like cuttlefish ink, chimney soot, flakes of rust, vinegar, and rainwater.

He would use already diluted ink in his paintings to create the old faded effect. Shaun Greenlaugh, a fraudster arrested in 2007, says that one of the first things people look for in an old master painting is corrosion from oak gall ink.

One of the major components of the ink is sulfuric acid. To emulate the corrosive effect, Hebborn suggests depositing extra acid with the help of a very sharp quill at places of highest ink concentration.

Now, coming to the most challenging ones, the oil paints. The pigments must be chemically era-appropriate. Many commercially available white pigments contain minerals such as titanium dioxide (even if the tube says zinc white), which weren’t used in paints until the mid-1900s. Thus, forgers mix their own white pigments (generally, zinc dioxide) for the paintings.

Dutch painter Han Van Meegeren, one of the most notorious forgers of the 1900s, even fooled the Nazis with his Jan Vermeer forgeries. During his trial, he mentioned that he would grind lapis lazuli to make blue dye, since Ultramarine and Prussian blue pigments available today didn’t exist in the 17th century.

Lapis Lazuli
Lapis Lazuli (Photo Credit : Pixabay)

Old paintings harden and shrink over time to form a network of cracks known as craquelure. Van Meegeren really paid attention to science, using bakelite with paint to harden it quickly, as well as make it alcohol-resistant.

He baked his paintings under controlled temperature to dry and ran the canvas over a pipe to create cracks. He later lined the cracks with black ink to make them prominent. Some forgers also add eggs to paint for faster drying.

Detail of a woman's eye on an old baroque oil painting(stoupa)s
Craquelure is seen in old oil painting (Photo Credit : stoupa/Shutterstock)

Ken Pereyni, a 20th century forger, mentions his techniques in his book “Caveat Emptor”. Since he was also an art restorer, he worked closely with real paintings, and knew what experts and scientists looked for to spot a fake.

He would use a thin layer of catalyzed lacquer over his paintings to make them acetone resistant. The cracks of old paintings formed in a web-like pattern, and rolling over a pipe created unidirectional cracks. He would use a soft rubber ball to apply slight pressure on the canvas to replicate the web-like cracks.

Wrecking Ball Shattering The White Wall(3Dsculptor)s
Ken Pereyni created a similar cracking pattern on his forgeries with a rubber ball (Photo Credit : 3Dsculptor/Shutterstock)

He discovered that old varnishes contained sugar and would attract flies, which would leave specks that would turn black over time. Pereyni mastered the art of recreating the effect. He would use epoxy glue/thick linseed oil and pigment to create tiny bumps in the painting.

Art dealers started using UV lights to check for fluorescence in old paintings. The varnish used over the painting consists of organic compounds that over time show fluorescence (shines green like radium paint) under a UV light.

Pereyni would swab out old varnish from the paintings he restored with a cleaning solvent, then mix it with new varnish and spray it over his forgeries. Lo and behold! They would shine bright green under the UV light.

Curcumin fluorescence
Old varnishes show similar glow under UV light (Photo Credit : Holger M Mürk/Wikimedia Commons)

Finally, to make the painting look recently discovered, he would dust the forgery with rotten stone powder. And leave it out to dry in the sun so the paint smell would wear off.


Forgers try to live in the minds of art and forensic experts to avoid getting caught. They try to envision and emulate the tell-tale signs of what would make the fakes look real. However, no matter how hard they try, quoting the movie- The Best Offer, “There is always something authentic concealed in every forgery”. And that’s how forensic science gets them!

Also Read: How Does Science Help Solve Crimes? The Real Life Science Of Crime Scene Investigation And Forensics

References (click to expand)
  1. How to forge a masterpiece | BBC Science Focus Magazine. BBC Science Focus
  2. How to forge a masterpiece - BBC Culture. BBC Online
  3. Denis Dutton on art forgery.
  4. Lopez J. (2008). The Man who Made Vermeers: Unvarnishing the Legend of Master Forger Han Van Meegeren. Harcourt
  5. Perenyi K. (2012). Caveat Emptor: The Secret Life of an American Art Forger. Open Road Media
About the Author

Sanjukta Mondal is a Chemist (Master of Science) from Ramaiah University of Applied Sciences (India). She likes to experiment not only in the laboratory but also in the kitchen and behind the lens. She loves watching sci-fi and live-action superhero shows and continues to watch them painstakingly even after the quality degrades. She likes to explore tales associated with complex phenomena to commonplace objects.

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