The Mary Rose - Henry VIII’s 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 Sheffield, 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’s wood that could contribute to Mary Rose wood degradation.
The remains of the ship are currently on display in a purpose-built museum 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’s 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.
This project, which brings together an international interdisciplinary team of researchers from the University of Sheffield, 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: “It 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.”.