Cultural property radiography

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An early unit for producing medical X-radiographs. The set up does not drastically differ for taking X-rays of cultural objects.

The radiography of cultural property is the use of

pentimenti alterations in the course of painting or by later restorers, and sometimes previous paintings on the support. Many pigments such as lead white
show well in radiographs.

X-ray spectromicroscopy has also been used to analyse the reactions of pigments in paintings. For example, in analysing colour degradation in the paintings of van Gogh.[1]

These processes can reveal various details about objects that are not visible to the naked eye. This information, which includes structural elements, aids conservators as they assess object condition and consider treatment plans.

For three dimensional objects, the computed tomography (CT) has become a common tool, which when combined with analysis can, for example, "digitally unroll" or unfold and make possible the reading of fragile scrolls, books, or sealed correspondence.[2]

Use and precautions

Smithsonian, which operates the Museum Conservation Institute
.

Radiography of paintings

Altaussee Mine, where it was stored by the Nazis after it was taken from St Bavo's Cathedral, Ghent. It was later recovered by the Monuments Men
.

Conservators and art historians have used radiography to uncover technical information about paintings. Compositions of materials, previous alterations, and painting techniques have been revealed in X-rays.[6] This data has also been used to date works and identify forgeries.[7] Diagnostic and therapeutic X-ray systems are generally used to produce X-rays of paintings.[8] Infrared reflectography has also been used to see underdrawings and previous markings on painted canvases.[9]

elements. Depending on how much these pigments absorb X-rays affects how clear or opaque they will appear in the radiograph, this is known as X-ray fluorescence.[4][10] Lead white, for example, will absorb more rays and appear much more opaque on an X-radiograph than carbon black, which will allow most of the X-rays to pass through resulting in a clearer result on the radiograph.[4][11] To produce a radiograph of a painting, the radiographic film is placed on the painted surface and the X-ray tube is placed behind the canvas.[12][4]

Implementation

The Syndics of the Drapers' Guild by Rembrandt is in the collection of the Rijksmuseum
in Amsterdam.

An X-ray of the

Saint Bavo Cathedral in Ghent, Belgium revealed the structure and details of the large altarpiece's painting scheme. The complete radiography of the altarpiece was conducted between 2010 and 2011 as part of a project largely funded by the Getty Institute. The X-rays and other technical information that was gathered were used to prepare conservation treatments.[13]

The Sampling Officials of the Amsterdam Drapers' Guild, also known as the Syndics of the Drapers' Guild or more simply as the Syndics, was painted by Rembrandt in 1662. An X-ray of the painting revealed that Rembrandt fine-tuned the composition several times, alternating the glances between the figures and slightly changing their positions before he settled on that is known today.[14]

X-ray analysis revealed alterations to the paint of a sixteenth century portrait that had been identified as a Bronzino portrait of Eleanor of Toledo at the Carnegie Museum of Art in Pittsburgh, Pennsylvania. After a conservation treatment, which removed the added paint, the subject of the portrait was found to be Isabella de' Medici. The painting was also attributed to Alessandro Allori.[15][16]

An X-ray of the Syndics reveals Rembrandt's earlier compositions for the group portrait.

Victoria & Albert Museum was X-rayed, revealing that Millet had reused a canvas to complete this oil painting. The artist not only painted over a previous work, but he had also added strips of canvas to enlarge the painting area.[7]

According to X-rays taken of Twilight by

Jean Baptiste Camille Corot, also at the Victoria & Albert Museum, the artist painted over a previous picture that had not even dried yet. Pigments from the lower painting appear through cracks in the surface layer.[7]

The Old Guitarist by Pablo Picasso at the Art Institute of Chicago had been previously examined with visible and ultraviolet light, which had hinted at the possibility of an earlier composition. X-rays of the painting revealed that Picasso had originally painted two female figures behind the guitarist. The X-rays also penetrated far enough to reveal how Picasso had prepared the wooden panel for painting.[8]

Radiography of sculpture and other three dimensional objects

Detail of Tiffany glass

X-rays can provide a better picture of

Jewelry and other objects with inlaid pieces have been X-rayed to reveal more about their structure.[6]

Implementation

Radiograph of the African Songye Power Figure at the Indianapolis Museum of Art

The plaster cast of Michelangelo's David at the Victoria & Albert Museum was X-rayed revealing that the supports in David's legs were positioned similarly to that of bones in a human leg. The size of this particular piece required a portable machine to complete the X-rays.[17]

The

art nouveau style glass. In particular, they are investigating differences between Tiffany glass of New York and Austria's Loetz glass to learn more about differences in the manufacturing process.[18]

In the X-rays of a wooden power figure at the Indianapolis Museum of Art, conservators discovered that there were hollowed out sections through the center of the sculpture that connected three filled cavities. Information about the network inside of these sculptures has aided curators as they research the function of these pieces. The findings have led to the use of radiography to compare power figures in other collections.[19]

Radiography of textiles

X-rays can reveal information about layers of

dyes since metallic mordant has historically been used in the dye making process. Details about stitching patterns can also appear on X-rays.[20]
The Victoria & Albert Museum has used X-rays as a tool for several textile conservation projects.

An X-ray of foot inside a shoe

Implementation

X-rays of the

King George III Golden Jubilee Quilt from 1810 revealed concealed stitching patterns and fabric dyes.[20]

Conservators learned more about the complex stitching of the Sundial Coverlet, which dates to 1797, through X-rays.[20]

X-rays were used to understand some of the stains and stitching patterns on an Egyptian tunic, dating to AD 600–799, in the Victoria & Albert collection.[21]

Hidden design and structure details were visible on X-rays of pairs of

shoes in the V&A's collection.[22]

Radiography in archaeology

A mummy on display at the Louvre. X-rays provide a non-obtrusive way to research mummies.
Images of the Archimedes Palimpsest were taken under various lighting conditions to uncover gaps and alterations to the text.

Archaeological materials have also benefited from X-rays. X-rays of soil segments have revealed artifacts that have eroded away, leaving them nearly undetectable to the naked eye.

concretions
.

Implementation

Radiography has been used with human dry bones to diagnose pathologies, demonstrate trauma and assist age estimation through dentition eruption status.[28]

X-rays have been employed to analyze what is under the wrappings of

mummies.[26]
In addition to providing images of the bones within, X-rays have revealed the location of jewelry and other objects that were buried with the body without disturbing the wrappings.

The

scrolls, some beyond repair.[29]

X-ray technology was used to quickly identify individual

coins uncovered in a single container. Researchers did not have to wait for slower, traditional conservation methods to separate and decipher the coins.[30]

X-rays were among the imaging techniques used to uncover lost text on the Archimedes Palimpsest, which is in the collection of the Walters Museum in Baltimore, Maryland. The museum spearheaded an extensive research project on the palimpsest that employed various imaging techniques including ultraviolet, infrared, and X-radiography.[31]

The heavily corroded Antikythera mechanism, which was uncovered from a shipwreck at the beginning of the 20th century, has been X-rayed several times in an effort to understand how it works.

References

  1. PMID 21314202. Archived from the original
    (PDF) on 2017-03-31. Retrieved 2020-11-21.
  2. S2CID 232102719
    .
  3. ^ Art Conservation Archived 2016-04-27 at the Wayback Machine at the University of Delaware (2014). X-radiography. Retrieved from artcons.udel.edu
  4. ^ a b c d e Pigments through the Ages: X-rays. (n.d.) Retrieved from webexhibits.org
  5. ^ a b c d "Schreiner, B., Frühmann, B., Jembrih-Simbürger, D. & Linke, R. (2004). X-rays in art and archaeology: An overview. International Centre for Diffraction Data. Retrieved from icdd.com" (PDF). Archived from the original (PDF) on 2016-03-04. Retrieved 2015-11-22.
  6. ^ a b The British Museum (n.d.). X-ray diffraction analysis. Retrieved from britishmuseum.org
  7. ^ a b c Victoria & Albert Museum (n.d.). X-radiography of paintings. Retrieved from vam.ac.uk
  8. ^ a b The Art Institute of Chicago (n.d.). X-Radiography. Retrieved from artic.edu
  9. ^ Art Conservation at the University of Delaware (2014). Infrared Reflectography. Retrieved from artcons.udel.edu
  10. ^ Art Conservation at the University of Delaware (2014). X-ray fluorescence. Retrieved from artcons.udel.edu
  11. ^ The National Gallery (n.d.). X-rays. Retrieved from nationalgallery.org.uk
  12. ^ "Art Conservation at the University of Delaware (2014). X-radiography. Retrieved from artcons.udel.edu". Archived from the original on 2016-04-27. Retrieved 2015-11-22.
  13. ^ Closer to Van Eyck: Rediscovering the Ghent Altarpiece (2011). Retrieved from closertovaneyck.kikirpa.be
  14. ^ "Late Rembrandt - The Syndics, 1662". KPN Late Rembrandt. Retrieved 2015-12-04.
  15. ^ Rouvalis, C. (2014). The tedious intrigue of art conservation: How Carnegie Museum of Art conservators expose fakes, restore past glory, and play doctor to every art form imaginable. Carnegie Magazine, Spring 2014. Retrieved from carnegiemuseums.org
  16. ^ Cascone, S. (2014 July 1). Carnegie conservators reveal true face of Medici portrait. Retrieved from Artnet News.
  17. ^ Puisto, J. (2014). David revealed! Victoria & Albert Conservation Blog. Retrieved from vam.ac.uk
  18. ^ Schreiner, B., Frühmann, B., Jembrih-Simbürger, D. & Linke, R. (2004). X-rays in art and archaeology: An overview Archived 2016-03-04 at the Wayback Machine Retrieved from the International Centre for Diffraction Data
  19. ^ "The Songye X-ray Project". IMA Magazine. Indianapolis Museum of Art. Spring 2010.
  20. ^ a b c d Hackett, J. (2011). X-radiography as a tool to examine the making and remaking of historic quilts. Victoria & Albert Online Journal 3 (Spring 2011). Retrieved from vam.ac.uk
  21. ^ Haldane, E., Gillies, S., O’Connor, S., Batt, C. & Stern, B. (2009). Victoria & Albert Conservation Journal 57(Spring 2009). Retrieved from vam.ac.uk
  22. ^ Glenn, S. (2013). Seeing the unseen. Victoria & Albert Conservation Blog. Retrieved from vam.ac.uk
  23. ^ Re, A., Corsi, J., Demmelbauer, M., Martini, M., Mila, G. & Ricci, C. (2015). X-ray tomography of a soil block: useful tool for the restoration of archaeological finds. Heritage Science 2015 3(4). Retrieved from heritagesciencejournal.com
  24. ^ Palmer, J. (2011). X-ray technique peers beneath archaeology’s surface. Retrieved from BBC news.
  25. ^ Kennedy, M. (2012). X-rays reveal secrets of Roman coins. The Guardian. Retrieved from theguardian.com
  26. ^ a b Gleeson, M. (2015). Animal mummy X-rays. Retrieved from The Penn Artifact Lab.
  27. ^ Re, A., Corsi, J., Demmelbauer, M., Martini, M., Mila, G. & Ricci, C. (2015). X-ray tomography of a soil block: useful tool for the restoration of archaeological finds. Heritage Science 2015 3(4). Retrieved from heritagesciencejournal.com
  28. doi:10.11141/ia.59.1
    .
  29. ^ Vergano, D. (2015). X-rays reveal snippets from papyrus scrolls that survived Mount Vesuvius. Retrieved from The National Geographic
  30. ^ Kennedy, M. (2012). X-rays reveal secrets of Roman coins. Retrieved from The Guardian.
  31. ^ The Archimedes Palimpsest: A-ray fluorescence imaging (n.d.). Retrieved from archimedespalimpsest.org
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