Articles tagged with: conservation

Shared space: Conserving a leather Sedan Chair

on Tuesday, 27 September 2016. Posted in Conservation

This leather sedan chair was on display at the Assembly Rooms, Bath. Staff from the Roman Baths Museum and Pump House contacted CMAS conservators with concerns about the condition of the item following an active pest infestation in objects displayed close to the chair.

The chair was removed from display and treated to remove the pest infestation using a non-destructive heat treatment.

On closer examination following the pest removal treatment it was determined that the chair was too fragile to return to display, and in need of a little TLC.

The leather exterior had been damaged and repaired a number of times during the life of the object. Notably, blue chalk script on a back panel identifies HF Keevil as the repairer of the chair in April 1942 following an air raid!

Leather damage detail
Leather repair detail

Many of the old repairs were failing and risked more significant damage if the loose areas were caught. Some small areas of fresh damage and loss had been noted, possibly due to areas being caught and knocked whilst the item was on open display; a common occurrence, for example by the bags of unsuspecting visitors.

Textile damage

In addition the textile interior was extremely fragile with large splits and tears and unravelling braiding.

Textile conservator

Due to the size of the item, its fragility and the combination of materials from which it is composed this project has proved challenging. The complexity of the textile repairs necessitated the expert assistance of specialist textile conservators from the studio Textile Conservation Limited. The large size and the fragility of the sedan chair’s surface meant that transportation was not recommended, requiring the work to be carried out on site.

From a block of soil...

on Tuesday, 05 July 2016. Posted in Archaeology, Conservation

The conservation team are celebrating this week as we have completed work on a beautiful and exciting project. Conservation of the stunning finds excavated from Bognor Regis by Thames Valley Archaeological Services in 2008 has come to fruition. The items form part of an unusual burial assemblage along with an iron ‘bed’ frame and sword and are thought to originate from the late Bronze Age/ early Iron Age.

Taking block of soil for x-ray

The finds first came to us in the unassuming form of a large soil block, this was too large to x-ray at our labs so was transported to a local hospital where x-rays revealed a large amount of intricate metal latticework and a helmet.

X-ray of soil block from hospital

The soil block was carefully excavated, layer by layer, revealing the spectacular nature of the copper alloy items held within. The helmet and latticework were extremely fragmented and fragile, the helmet was split in half and part of the lattice was adhered to the helmet with corrosion products.

King Henry VIII and Napoleon - A Week's Work Experience at the History Centre

on Friday, 27 May 2016. Posted in History Centre

Every year the History Centre hosts work experience students from Year 10 to Higher Education. Alex, a year 10 student from Malmesbury School describes what he got up to during his week:

Recently I have had work experience at the Wiltshire and Swindon History Centre in Chippenham. On my first day I got shown around the strongrooms which they have lots of original documents, records and certificate etc. I actually saw King Henry VIII’s marriage deed with Jane Seymour. After that I saw Archives Conservation and got told how they restore letters, papers and maps, I also saw a small piece of Napoleon’s hair, and a really nice photo album. I also had a look at a newspaper by Swindon Advertiser in 1918 and 1919 which was really interesting to look at all the different stories they had at that moment in time.

Marriage settlement of Jane Seymour and Henry VIII 1536 (1332/1/1/1MS)

On the second day for the morning I was copying and pasting wills onto a disc for a researcher. Then I got an original document from the strongroom and I had to find the names and occupations of people, where they lived and the year, but it was sometimes really hard to find some people because the writing was really hard to read and some documents did not give names. After lunch I went into the object conservation lab and saw a sole from a roman shoe in the wet room with a freeze dryer, also I went into an x-ray room. After that I saw a very old ceramic pot that had been damaged by a badger when it was digging, the people in the lab were trying to put it back together. After that I did community history and I had an introduction to the Wiltshire Community History website and was able to look at all the different parishes that they have written information about.

Conservation of finds unearthed by a badger

on Saturday, 16 April 2016. Posted in Archaeology, Conservation

You may remember the image of a group of ceramic sherds from one of our previous blog posts. Following reconstruction of the vessel we now have true understanding of the magnificence of the objects found. Watch a time-lapse video showing elements of the reconstruction of the vessel.

 

Conservation treatment involved a task like a jigsaw puzzle without a picture. The size, shape and colours of the sherds were used to determine their original location within the urn. Due to the uneven firing of the vessel and areas of burning caused by hot ashes being placed inside the vessel some areas were easier to piece together than others.

When the collared urn was originally manufactured ceramic technology was in its infancy with the kilns used never reaching the temperature required to permanently set the clay in position. During the time the vessel was in the ground, moisture from the surrounding earth also weakened the under-fired structure. This effect, on top of the unconventional excavation method, has meant that the overall shape of the vessel has become distorted.

Before reconstruction the edges of each fragment were strengthened by allowing a weak adhesive to be drawn into the rough surface to hold the loose and sometimes crumbling structure together. The adhesive is well used in conservation and has been developed and tested to ensure that it is long-term stable meaning it will not degrade causing damage to the original fragments of the vessel.

A stronger concentration of the same adhesive was used to adhere the fragments in position, small strips weak masking tape were used to hold the fragments in position as they dried. As the vessel was so large the reconstruction had to be undertaken in stages to ensure each level of fragments were securely in position and ready to support those placed on top.

The conservation team turn detective! Part 2

on Thursday, 29 October 2015. Posted in Conservation

Curing the salt contamination in a pair of Imari vases. A serial conservation mystery, episode 2

In May we discovered that the Imari vases which had been brought to the lab from Wilton House were suffering from a case of salt contamination http://wshc.eu/blog/item/the-conservation-team-turn-detective.html. The salt had caused large cracks up the side of the vases reducing their structural stability and causing loss of some fragments and areas of glaze.

Developing a treatment

Removing salt from an object is best completed by dissolving the salts into water and removing the contaminated water from the vase taking the salt with it. If not all the contaminated water is removed during the treatment some salt will remain and the process of crystallisation will begin again, causing further deterioration.

To try out our treatment options we needed to create some test patients with similar symptoms to the Imari vases.

Undertaking clinical trials

The test patients were contaminated with salts from the base up to simulate the issue with the Imari vases.

Due to the size, weight and fragile nature of the vases treating only the affected area would be the ideal solution. We tested using a poultice made from blotting paper, cartridge paper and distilled water.

To use a poultice you apply a thin layer to the affected area and allow to dry. As the water evaporates from the surface of the poultice the salty water in the centre of the pot is drawn out and the salts are deposited in the poultice. The dried poultice can then be removed taking the salt with it.

The clinical trial turned out to prove the treatment was not effective, instead of evaporating from the poultice some of the water was drawn into the test pot and evaporated from the exposed rim leaving the salts behind.

It was clear that a plan B would have to be developed....

Malmesbury Fire Pump

on Saturday, 08 August 2015. Posted in Museums

Last year we posted a blog about work we did to conserve Malmesbury’s historic fire pump for display. The pump is one of the largest items the museum owns and arranging a space suitable for it to be displayed in was not straight forward for the museum. For this reason the fire pump had to go back into storage whilst a display area was arranged for it. But recently I have been able to go back and help with putting the item on display.

The pump belongs to the Athelstan museum in Malmesbury but is too large to fit in their own store so it has been kept in a commercial storage facility in an old aircraft hangar. I met the curator at the storage site along with two members of the modern fire brigade who had volunteered to help move the object. It was interesting to hear their opinion on this piece of historic fire fighting equipment. In particular I learnt that that although I had been calling it a fire engine it should in fact be called a fire appliance or pump. Apparently the modern fire service does not use the term fire engine at all. In the case of the appliance I had worked on it should not be called an engine as it does not have any sort of engine or motor. Its pump was powered by people pushing its handles up and down.

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