British Museum blog

After-excavation care at Amara West

Elisabeth Pamberg, archaeological illustrator/conservator

Salt crystals on the rim of beer jar C8008

I visited the stores where we keep the objects excavated from the site, to check they were in good condition. Objects from a site like this one often contain salts that could damage them, so I wasn’t surprised to observe that several objects had salt crystals on them, particularly the pottery and some stone sculpture.

The artefacts retrieved at Amara West are subject to environmental conditions which include high humidity and salinity, the result of the site’s proximity to the Nile. Ceramic and stone buried in soil absorb the salts present in the deposits.

Beer jar C8007 after desalination this week

Following my advice, and discussions with Marie Millet and Neal Spencer, two beer jars from grave 201 were chosen for treatment, as they were affected by salt, with a thick visible layer of white concretions.

The salts are harmful and are not only an aesthetic issue; they obscure the object’s surface and can lead to surface exfoliation – the surface lifting off. Eventually, the crystallisation of salts can lead to disintegration.

The most efficient way to extract salt consists of soaking the objects in water over a long period of time, though extra steps need to be taken with fragile objects, or those bearing paint.

The removal of soluble salts can be a very lengthy procedure. In this case, the jars were bathed repeatedly in plenty of warm water for a period of eight days with the water being changed every day.

Unfortunately, no distilled or deionised water and conductivity meter (to measure the decreasing level of salt) is available here. Nonetheless, soluble salts appear to have completely disappeared from the jars, ensuring their long-term preservation.

Looking to future seasons, we might consider testing salt levels in the local river water, which is used for washing all pottery prior to study, recording and storage.

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The next gallery in our #MuseumOfTheFuture series is Room 67: Korea. The Korea Foundation Gallery is currently closed for refurbishment and will reopen on 16 December 2014. You can find out more about the refurb at koreabritishmuseum.tumblr.com  The unique culture of Korea combines a strong sense of national identity with influences from other parts of the Far East. Korean religion, language, geography and everyday life were directly affected by the country’s geographic position, resulting in a rich mix of art and artefacts.
Objects on display in Room 67 date from prehistory to the present day and include ceramics, metalwork, sculpture, painting, screen-printed books and illuminated manuscripts.
A reconstruction of a traditional sarangbang, or scholar’s study, is also on display and was built by contemporary Korean craftsmen. This is Room 66, Ethiopia and Coptic Egypt. It's the next gallery space in our #MuseumOfTheFuture series.
By the 4th century AD, Christianity was flourishing in both Egypt and Ethiopia. Christian Egyptians became known as the Copts (from the Greek name for Egyptians) and the church maintained strong links with its Ethiopian counterparts. Since antiquity, Ethiopia had been a major trade route, linking Egypt and the Mediterranean with India and the Far East.
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See this cartonnage mask in our exhibition #8mummies – now extended until 19 April 2015.
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