Lapis lazuli amulet in the shape of a wedjat-eye; unpierced suspension ring at the top.
- Found/Acquired: Egypt
- Length: 2.06 centimetres
- Width: 1.43 centimetres
- Thickness: 0.37 centimetres
15 August 2012
Reason for treatment
Remove object from fabric coated wooden mount. Remove any adhesive residues. Apply collection numbers as appropriate.
During the Faience survey 2009 salts were seen on the surface of objects. Analytical Request report AN2010-72 identified crystals as formate salts. Oddy testing confirmed that the wooden mounts covered in fabric are off gassing releasing formic acid. It has therefore been recommended that all objects mounted on this type of mount are removed. Objects are glued onto the mount, either with shellac or animal glue. Sometimes pinning and gluing has been used in combination. The majority of the objects are stable and require no further treatment however many require the application of the collection BIG number.
If the amulet was stuck to the mount, a scalpel was used to cut the amulet away from the mount with the fabric attached. Adhesive bonding the object to the fabric was softened by applying cotton wool on the reverse wetted with either I.M.S. (Industrial Methylated Spirits) or warm water as appropriate. Once softened the fabric was removed from the object and adhesive residues removed with either a scalpel or swabs as appropriate. If numbering was necessary a barrier layer of 20% Paraloid B72 (ethyl methacrylate copolymer) in acetone was applied in a discrete position. The BIG number was applied with a brush under magnification using either black or white ink (Aerocolor Professional acrylic ink).
Ancient Egypt & Sudan
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Object reference number: YCA47520
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