Power House – Object Conservation 2

Object: Brass belt plate (mid 19th century) I.979 ii

Blogger: Nyssa Mildwaters, Conservation

It’s always nice to work on an object which can be related back to a particular person in history. This belt plate is one of a pair of objects relating to the Board of Ordnance’s only identified rat-catcher, Richard Dean.

The plate is the only surviving portion of Dean’s uniform and he can be seen wearing it in a portrait which is to be displayed alongside the plate. The brass belt plate is engraved with a rat shown sitting below the arms of the Board of Ordnance, whilst around the edge the inscription reads ‘Richard Dean, Chislehurst, Rat Destroyer to the Honorable Board of Ordnance’.

Belt Plate

Belt Plate

In order to make the letters and images engraved on the plate stand out a black enamel-like material was originally applied to the object. Unfortunately over time this material has cracked and in some areas has been lost. Where damage to the enamel had occurred traces of a powdery green corrosion could also be seen.  The powdery corrosion was carefully removed from the damaged lettering and other areas of decoration using a scalpel whilst under magnification. Once clean it was necessary to stabilise the enamel to prevent any further cracking or loss, this was done by running a thin adhesive solution into the damaged areas.

Before and after conservation

Before and after conservation

In addition to the problems with the lettering several finger and palm prints were clearly visible and spread across the plate. When we handle metal objects with our bare hands the sweat and oils on our fingers are transferred to the objects and if not swiftly removed can become etched into the objects’ surface. Sadly there is no way of removing finger prints once they are etched into a metal surface without removing the object’s top layer at the same time. Once fingerprints are imprinted they are generally there for good, which is why conservators always ask people to wear gloves when handling or moving objects.

This object will be featured in our forthcoming Power House exhibition at the Tower of London. Find out more about the work of our Conservation Team on our website.