The Mary Rose gets conservation boost from new x-ray technique

The Mary Rose - Henry VIII鈥檚 favourite warship - has received a major boost from a researcher at the University of 葫芦影业 to help conserve the ship for future generations.

The remains of the Mary Rose on display in The Mary Rose Museum
The remains of the Mary Rose on display in a dedicated museum in Portsmouth Historic Dockyard. Copyright: The Mary Rose Trust
  • University of 葫芦影业-led research team has used a new x-ray method to discover the structure of potentially harmful substances within the remains of the Mary Rose
  • Researchers discover zinc-containing nanoparticles lodged within the ship鈥檚 wooden hull that could lead to degradation
  • New x-ray technique enables potentially harmful substances to be studied without causing damage to the priceless artefact for the first time
  • Development can inform how the Mary Rose and other important archaeological remains are conserved for future generations

The Mary Rose - Henry VIII鈥檚 favourite warship whose remains were brought to the surface in a massive salvage operation broadcast to over 60 million people around the world 39 years ago this month - has received a major boost to help conserve the ship for future generations.

A team of researchers, led by Professor Serena Cussen from the University of 葫芦影业, has used a new x-ray technique available at the European Synchrotron Radiation Facility (ESRF) to discover the presence, location and structure of nanostructured bacterial byproducts lodged within the ship鈥檚 wood that could contribute to Mary Rose wood degradation. 

The remains of the ship at Portsmouth Historic Dockyard, but they are vulnerable to degradation after spending more than 400 years at the bottom of the sea where harmful deposits collected inside the ship鈥檚 wooden hull. These deposits originate from degradation of metal fixtures and artefacts after centuries spent under the seabed and the activity of anaerobic sulfur-reducing bacteria and can lead to the formation of harmful acids.

The Mary Rose on display in The Mary Rose Museum
Copyright: The Mary Rose Trust

This project, which brings together an international interdisciplinary team of researchers from the University of 葫芦影业, the University of Copenhagen, Columbia University, the ESRF and the Mary Rose Trust, has applied a new x-ray computed tomography method to unlock detailed information about these deposits. Applying this method also overcomes the additional challenge of studying precious cultural artefacts where care must be taken to avoid damaging the fragile remains as these experiments can be performed without destroying the sample. 

Up to now, it has not been possible to obtain detailed information about the structure of harmful deposits within the wood. As Professor Cussen explains: 鈥淚t is remarkable that this technique, available at the ESRF, allows us not only to image and locate these nanoparticles in Mary Rose wood, but also to evaluate their structure. This is the first time zinc sulfide nanostructures have been observed in Mary Rose wood. This is because it is really challenging to assess the range of material present within archaeological samples.鈥

Using the new technique, which combines x-ray computed tomography with pair distribution function analysis (ctPDF), the team has mapped out the location and structure of nanostructured compounds lodged within the ship鈥檚 wooden hull. The team have also uncovered the location of organic polymer deposits within the wood, a result of polymer treatments applied to compensate for degradation of the wood. If the polymer starts to breakdown, it would produce degrading acids that could damage the Mary Rose - so knowing where the polymer is within the ship鈥檚 wood and tracking it over time is crucial to conserving the artefact.  

A close up of the wood of the Mary Rose
Copyright: The Mary Rose Trust

Professor Serena Cussen added: 鈥淭hese developments mean that potential threats to the wood can be tracked - a vital step in developing conservation strategies for the future of the Mary Rose. With the insights we have gathered from this experiment we鈥檝e been developing new magnetic nanoparticle-based treatments to target and remove these harmful species from the Mary Rose. This will help us preserve this priceless artefact for years to come. This x-ray method could also be used to inform strategies to preserve other important archaeological discoveries.鈥

Professor Eleanor Schofield, Deputy Chief Executive Officer at the Mary Rose Trust, said: 鈥淭he application of this technique to complex archaeological materials presents a really exciting advancement for the field of heritage science. To be able to look inside a piece of Mary Rose wood and see not only the structure but also the level of degradation, previous conservation treatments and other inclusions from the marine environment, is a fascinating insight. It provides us with a wealth of knowledge which we can use to further understand how the materials will react to certain treatments and environments and from that, devise future conservation strategies to keep them safe for years to come.鈥

The Mary Rose on display in The Mary Rose Museum
Copyright: The Mary Rose Trust

Professor Simon Billinge, Professor at Columbia University, said: 鈥淚t was particularly exciting to get a glimpse into the history of the Mary Rose in the years since it sank. The zinc sulfide deposits come from anaerobic bacteria living in the wood as it sat sunk in the seabed, and our results were like a micro-scale archeological dig where by studying the location and composition of the deposits we could see how the bacteria colonised the wood and what they ate.鈥

See the remains of the ship on display at a dedicated museum in Portsmouth Historic Dockyard. Copyright: The Mary Rose Trust.

Dr. Kirsten M. 脴. Jensen, associate professor at University of Copenhagen, said: 鈥淎nalysing the very large X-ray scattering datasets we collected from the Mary Rose wood was like a treasure hunt, where we were looking for signatures of the substances residing in the wood. In the end, our analysis of the data made it possible to obtain very detailed structural information on the zinc-containing nanoparticles, which can now aid in developing new conservation methods.鈥

Watch researchers involved the project explain more about what they discovered in the remains of the Mary Rose. Credit: ESRF.

Dr Marco Di Michiel, scientist in charge of beamline ID15 at ESRF, said: 鈥淭his is the first time that we have used the technique of x-ray total scattering with computed tomography to successfully study cultural heritage samples at the nanoscale. This work opens doors to new experiments in the domain of conservation." 

The research using the new x-ray technique is published in a paper titled 'Location and characterization of heterogeneous phases within Mary Rose wood' in the journal Matter. To access the paper in full, visit: 

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