Public Release: 

High-tech imaging reveals precolonial Mexican manuscript hidden from view for 500 years

Elsevier

OXFORD, 16 August 2016 - Researchers from the University of Oxford's Bodleian Libraries and from universities in the Netherlands have used high-tech imaging to uncover the details of a rare Mexican codex dating from before the colonization of the Americas. The newly revealed codex, or book, has been hidden from view for almost 500 years, concealed beneath a layer of plaster and chalk on the back of a later manuscript known as the Codex Selden, which is housed at the Bodleian Libraries. Scientists have used hyperspectral imaging to reveal pictographic scenes from this remarkable document and have published their findings in the Journal of Archaeological Science: Reports.

Ancient Mexican codices are some of the most important artefacts of early Mexican culture and they are particularly rare. Codex Selden, also known as Codex Añute, dates from around 1560 and is one of fewer than 20 known Mexican codices to have survived from pre-colonial and early colonial Mexico. Of those, it is one of only five surviving manuscripts from the Mixtec area, now the Oaxaca region of Mexico. These codices use a complex system of pictures, symbols and bright colours to narrate centuries of conquering dynasties and genealogies as well as wars and the history of ancient cities. In essence these codices provide the best insight into the history and culture of early Mexico.

Since the 1950s, scholars have suspected that Codex Selden is a palimpsest: an older document that has been covered up and reused to make the manuscript that is currently visible. Codex Selden consists of a five-metre-long strip composed of deer hide that has been covered with gesso, a white plaster made from gypsum and chalk, and folded in a concertina format into a 20-page document. The manuscript underwent a series of invasive tests in the 1950s when one page on the back was scraped, uncovering a vague image that hinted at the possibility that an earlier Mexican codex lay hidden beneath.

Until now, no other technique has been able to unveil the concealed narrative in a non-invasive way. The organic paints that were partly used to create the vibrant images on early Mexican codices do not absorb x-rays, which rules out x-ray analysis that is commonly used to study later works of art.

'After four or five years of trying different techniques, we've been able to reveal an abundance of images without damaging this extremely vulnerable item. We can confirm that Codex Selden is indeed a palimpsest,' said Ludo Snijders from Leiden University, who conducted the research with David Howell from the Bodleian Libraries and Tim Zaman from the University of Delft. This is the first time an early Mexican codex has been proven to be a palimpsest.

'What's interesting is that the text we've found doesn't match that of other early Mixtec manuscripts. The genealogy we see appears to be unique, which means it may prove invaluable for the interpretation of archaeological remains from southern Mexico,' Snjiders said.

Some pages feature more than 20 characters sitting or standing in the same direction. Similar scenes have been found on other Mixtec manuscripts, representing a King and his council. But the analysis of this particular text shows that the characters are both male and female, raising interesting questions about what the scene represents.

The imaging has also revealed a prominent individual who appears repeatedly on the document and is represented by a large glyph consisting of a twisted cord and a flint knife. The name seems to resemble a character found in other Mexican codices: the Codex Bodley (in the Bodleian's collection) and Codex Zouche-Nuttall (in the British Museum).That character is an important ancestor of two lineages connected to the important archaeological sites of Zaachila and Teozacualco in Mexico. However, further analysis is needed to confirm that it is the same individual.

The researchers analysed seven pages of the codex for this study and revealed other images including people walking with sticks and spears, women with red hair or headdresses and place signs containing the glyphs for rivers. They are continuing to analyse the remainder of the document with the aim of reconstructing the entire hidden imagery, allowing the text to be interpreted more fully.

'Hyperspectral imaging has shown great promise in helping us to begin to reconstruct the story of the hidden codex and ultimately to recover new information about Mixtec history and archaeology,' said David Howell, Head of Heritage Science at the Bodleian Libraries. 'This is very much a new technique, and we've learned valuable lessons about how to use hyperspectral imaging in the future both for this very fragile manuscript and for countless others like it.'

Working with the Humanities Division in the University of Oxford, the Libraries acquired the hyperspectral scanner in 2014 with the support of the University's Fell Fund. Once a technique used by astrophysicists to study the colour of stars, hyperspectral imaging is now used by Bodleian researchers to reveal hidden text and images and identify unknown substances and pigments with a high degree of accuracy. Researchers have recently used the scanner to clarify the text of the famous Bakhshali manuscript from India, which includes the first use of zero, to analyse the medieval Gough Map, the earliest road map of Great Britain and to reveal a hidden devil in a centuries-old Armenian gospel-book.

###

Notes to editors:

'Using hyperspectral imaging to reveal a hidden precolonial Mesoamerican codex' was published online on 21 July 2016 in the Journal of Archaeological Science: Reports. It was co-authored by Ludo Snijders, a PhD researcher from the Faculty of Archaeology at Leiden University in The Netherlands, Tim Zaman, a PhD researcher from the Quantitative Imaging Group at Delft University in The Netherlands and David Howell, Head of Heritage Science at the University of Oxford's Bodleian Libraries.

The study was funded by NWO, the Netherlands Organisation for Scientific Research as part of its Science4Arts programme.

For further information, or to request interviews or images, please contact:
Elaine Bible
PR & Communications Officer, Bodleian Libraries
elaine.bible@bodleian.ox.ac.uk Tel: +44 (0) 1865 277627

Copies of this paper are available to credentialed journalists upon request; please contact Elsevier's Newsroom at newsroom@elsevier.com or +31 20 485 2492.

About the Bodleian Libraries

The Bodleian Libraries at the University of Oxford is the largest university library system in the United Kingdom. It includes the principal University library - the Bodleian Library - which has been a legal deposit library for 400 years; as well as 30 libraries across Oxford including major research libraries and faculty, department and institute libraries. Together, the Libraries hold more than 12 million printed items, over 80,000 e-journals and outstanding special collections including rare books and manuscripts, classical papyri, maps, music, art and printed ephemera. Members of the public can explore the collections via the Bodleian's online image portal at digital.bodleian.ox.ac.uk or by visiting the exhibition galleries in the Bodleian's Weston Library. For more information, visit http://www.bodleian.ox.ac.uk.

About the Bodleian's early Mexican codices

The Bodleian Libraries holds five precolonial and early colonial Mexican manuscripts. They are the largest single group to survive together in one place. They include the Codex Selden, or Codex Anute, which was given to the Bodleian by the scholar and collector John Selden in the 17th century. The other manuscripts include the well-known Codex Mendoza, which has a traditional book format and dates from the cusp of colonial rule around 1541, Codex Laud, a screenfold which is bound in jaguar skin, another Mixtec screenfold called Codex Bodley, and the Selden Roll, recently renamed The Roll of the New Fire.

About the Journal of Archaeological Science: Reports

The Journal of Archaeological Science: Reports is aimed at archaeologists and scientists engaged with the application of scientific techniques and methodologies to all areas of archaeology. The journal focuses on the results of the application of scientific methods to archaeological problems and debates. It will provide a forum for reviews and scientific debate of issues in scientific archaeology and their impact in the wider subject. The Journal of Archaeological Science: Reports will publish papers of excellent archaeological science, with regional or wider interest. This will include case studies, reviews and short papers where an established scientific technique sheds light on archaeological questions and debates.

Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.