Priya Kapoor
Art forgery is a lucrative business, with a single knockoff having the potential to finance a forger's retirement. As the prices of artworks soar, so does the incentive to create forgeries, and the frauds are getting better. Scientific methods have been developed to detect forgeries, including the use of microscopes, X-ray technology, and mass spectrometry. However, even experts do not always agree on the authenticity of a particular item, and sometimes, forgers manage to deceive them. The art world is facing a crisis of authentication, with museums, galleries, auction houses, and experts struggling to distinguish real artworks from imitations.
| Characteristics | Values |
|---|---|
| Scientific methods | Infrared reflectography, infrared spectroscopy, Raman spectroscopy, mass spectrometry, microscopy, X-ray technology |
| Pigments | Presence of certain chemical groups and molecular fragments |
| Craquelure | Cracks that appear in older paintings over time |
| Provenance research | Ownership history, including record of who owned the artwork and when |
| Signature | Placement and positioning are important; good forgers can reproduce signatures but may overlook standard placement |
| Artist catalogue | A catalogue raisonné details all of an artist's known artworks |
| Canvas | Light should come through the back of the canvas; forgeries are often printed copies with no light coming through |
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What You'll Learn
Scientific methods to detect forgeries
Scientific methods are essential in detecting art forgeries and can provide valuable insights. While no single method can conclusively prove authenticity, combining multiple techniques increases accuracy. Here are some scientific approaches to expose fake paintings:
Visual Techniques
The use of ultraviolet (UV) light is a common practice to detect alterations or additions to a painting. Under UV light, varnish and paint layers exhibit different fluorescence colours. Ultraviolet rays can also be employed to examine marble sculptures, distinguishing modern pieces from old ones based on their fluorescent hues. Infrared rays are another valuable tool, allowing the penetration of thin paint layers to reveal underlying paintings or signatures.
Elemental or Structural Techniques
These methods identify the chemical elements and complex structural information present in a painting. Techniques like X-ray fluorescence (XRF) and proton-induced X-ray emission (PIXE) help detect the presence of certain elements that should not be in a painting, indicating potential forgery. Mass spectrometry is another powerful tool to identify the presence of specific pigments or elements like lead, which was commonly used in older paintings but is rare today due to the risk of lead poisoning.
Dating Techniques
Dating methods, such as carbon dating, help determine the age of a painting. Mobile nuclear magnetic resonance uses radiofrequency pulses in a magnetic field to analyse paint stratigraphy and ageing, potentially exposing artificially aged paintings.
Microscopy
Microscopy, including the use of optical microscopes and Fourier-transform infrared microscopes, allows for a detailed examination of paint samples, revealing crucial information about the painting's authenticity.
Provenance Research
While not a scientific method, provenance research involves investigating the history of an artwork through records, archives, and art historical research methods. It helps authenticate a painting by confirming its ownership history and uncovering essential details, such as whether it has been stolen.
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The importance of provenance
The art world is rife with forgeries, fakes, and misattributions. In recent years, the value of artworks has skyrocketed, with auction sales alone accounting for over $850 million in 2017. This surge in monetary value has incentivized proficient forgers to create expert imitations of old masters, financing comfortable retirements with a single sale. The incentive to forge is high, and the technologies available to forgers have improved, creating a crisis of authentication for art institutions worldwide.
The process of authentication is complex and multifaceted. Scientific methods, such as infrared reflectography, Raman spectroscopy, and mass spectrometry, can be used to analyze the layers, pigments, and chemical composition of a painting. These techniques can reveal details about the painting's creation, helping to identify potential discrepancies that indicate forgery. For example, the identification of modern pigments or materials in a purportedly ancient work is a tell-tale sign of a fake.
However, scientific methods alone may not be sufficient. The interpretation of data often requires an expert, and even then, the authenticity of a work may remain disputed. This is where the concept of provenance becomes crucial. Provenance refers to the ownership history of an artwork—a detailed record of who owned the piece and when. Ideally, this record would trace the artwork's journey from the artist's easel to the present day.
Provenance research is an essential tool in forgery detection. By unraveling the ownership history of a work, investigators can uncover important details that raise red flags or provide supporting evidence of authenticity. For example, gaps in the provenance of a work, such as undocumented ownership for extended periods, can cast doubt on its authenticity. Additionally, provenance research can reveal whether the artwork has been stolen or whether it was legally obtained.
The investigation of provenance involves scrutinizing public and private records, archives, correspondence, catalogues, and sales receipts. This meticulous process can help validate or refute the attribution of an artwork to a particular artist. For instance, if an artwork is purported to be by a specific artist, but the provenance research reveals that the artist could not have created the work due to timeline inconsistencies or other factors, then the work is likely a forgery or misattribution.
In summary, the importance of provenance in the art world cannot be overstated. It serves as a critical tool in the detection of forgeries, the validation of authenticity, and the safeguarding of art buyers and collectors. While scientific methods play a vital role in forgery detection, the intricate web of an artwork's ownership history, revealed through provenance research, provides essential context and insights that contribute to the overall assessment of a work's authenticity.
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Brushwork and painting style
The style of a painter is unique to them, and this can be a key factor in authenticating a painting. This includes the way they stroke their brush and the canvas they use. Scientific methods can be used to identify a fake painting, and these methods can be clustered into three categories: visual (or imaging), elemental (or structural), and dating techniques.
One of the visual techniques is X-radiography, which uses X-rays to obtain an image that contains information about the different layers of a painting. This can be useful in determining whether a painting is on a reused canvas, which is a common practice for forgers to make their work seem older. Another visual technique is infrared reflectography, which can be used to obtain images of the sketch layer. While this does not necessarily indicate a forgery, as artists may change their minds during the creative process, significant differences between the sketch and the final product should be further investigated.
Microscopes can be used to observe craquelure, or the cracks that appear in older paintings over time. Craquelure is like a painting's fingerprint, and the patterns are incredibly difficult to replicate in a fake. Thus, under a microscope, art scientists can determine if a painting has the correct pattern of craquelure.
Another scientific method is mass spectrometry, which can be used to identify the pigments used in a painting. This method is invasive, as a sample of the painting must be removed for analysis. However, it can be used to detect the presence of certain chemical groups and molecular fragments, helping to determine if pigments were available at the time the painting was supposedly made.
Other techniques can be used to determine the authenticity of a painting. For example, authentic pieces often allow some light to come through the canvas when held up to the light, while prints often do not. Additionally, original art pieces typically have several layers visible to the naked eye, while forgeries tend to lack depth. It is important to know the types of paint used during the era of the piece in question, as this can be a telltale sign of a forgery.
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Signatures and certificates
Signatures are an important aspect of authenticating a painting. The practice of signing a painting began in the 14th century when the monetary value of artwork became linked to the identity of the artist. Signatures can be challenging to reproduce, especially if the artist has a unique signing style, like Picasso, who signed his works in pencil with angled and spaced-out lettering. Good forgers can replicate signatures, but they may overlook the standard placement used by the artist. For instance, a forged Jackson Pollock painting sold for $280,000 had his surname misspelled as "Pollok".
Examining the signature and its placement can be crucial in detecting forgeries. For example, the addition of Rembrandt's signature to an old painting that isn't actually his can be detected through microscopic analysis of the paint layers. Scientific methods, such as infrared reflectography, can also be used to examine the sketch layer of a painting. While differences between the sketch and the final painting don't necessarily indicate a forgery, significant discrepancies warrant further investigation.
Analyzing the materials used in a painting is another essential aspect of forgery detection. Certain art mediums and materials were only available during specific historical periods. For instance, a purported 17th-century painting analyzed by Sotheby's was found to contain modern-day materials, revealing it as a forgery. Scientific techniques like infrared spectroscopy, Raman spectroscopy, and mass spectrometry can identify pigments and binders used in a painting. By comparing the detected masses of particular elements or molecules to known masses, experts can determine if a painting contains materials inconsistent with its supposed creation date.
Additionally, the presence of craquelure, or the cracks that appear in older paintings over time, can be indicative of authenticity. Different painting styles, regions, and time periods exhibit distinct craquelure patterns that are challenging to replicate in forgeries. Microscopic analysis can reveal these intricate crack patterns, allowing experts to determine if a painting displays the expected craquelure for its purported origin and age.
The concept of provenance, or the ownership history of an artwork, is also crucial in forgery detection. Conducting provenance research involves unraveling the history of an artwork using public and private records, archives, and art historical research methods. Gaps or inconsistencies in the ownership history can raise red flags and prompt further investigation.
In summary, detecting art forgeries involves a multifaceted approach that includes scrutinizing signatures and their placement, analyzing paint layers and materials, examining craquelure patterns, and conducting thorough provenance research. By employing scientific techniques and leveraging expertise in art history, investigators can uncover the truth behind a painting's authenticity.
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Forgers' tricks and how to spot them
Forgers often have a good understanding of art history and chemistry, as well as a keen imagination and logical thinking skills. They may also be charismatic and trustworthy, enabling them to recruit middlemen such as art dealers and experts. A forger must first decide which work to forge, either by copying an existing piece or creating a new or 'long-lost' work and selling it as a new discovery. They may also choose to forge a lesser-known artist, as experts tend to be more meticulous with famous artists.
Forgers have been known to speed up the natural drying process of oil paint by adding eggs to the paint mixture. Although this would be revealed in a chemical analysis, it buys the forger time. They may also test their fakes to ensure they pass, for example, by using X-ray fluorescence guns to survey the chemical elements in their works.
To create a convincing fake, forgers will fabricate a paper trail, including letters, documents, and photographs, to support the authenticity of their work. They may also manipulate historical records and create complicated chains of events to make their narratives more plausible. This is known as a "provenance trap", where a work did not survive or may not have existed but could have. Forgers will also study the complete oeuvre of an artist to match their fakes to the artist's style.
To spot a forgery, scientific methods can be used, including visual (or imaging), elemental (or structural), and dating techniques. For example, infrared reflectography can be used to obtain images of the sketch layer of a painting and compare it to the final product. If there are significant differences, further investigation is warranted. Additionally, the presence of certain pigments that were not available at the time the painting was made can indicate a forgery. Techniques such as infrared (IR) spectroscopy, Raman spectroscopy, and mass spectrometry can be used to detect the presence of certain chemical groups and molecular fragments.
Other techniques include listening to the sound of a swab on the canvas or feeling the pull of the swab in the varnish, as well as using microscopes and X-ray machines to examine the layers of a painting.
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Frequently asked questions
Scientific methods can be used to detect art forgeries. For example, X-ray technology can be used to determine whether a painting is done on a reused canvas. Another method is infrared reflectography, which can obtain images of the sketch layer and reveal any differences between the sketch and the final painting.
Forgers have been known to harvest older materials to create new "old" paintings. They also test their fakes to ensure they will pass as genuine.
Hold the painting up to the light and view it from the back. Authentic pieces will typically allow some light to come through the canvas, while prints will not.
Provenance research can be used to verify the ownership history of a painting. Scientific methods such as mass spectrometry can be used to detect the presence of certain elements, such as lead, which was commonly used by painters in the past.
