Caring for Your Gold & Ormolu

Pure gold will not corrode under normal conditions. However, it is very soft, so most 'gold' objects contain other metals such as copper and silver. These can corrode and discolour the surface of the gold. Any chemical treatment should be left to a specialist.

Cleaning gold & ormolu

Please read the Basic Guidelines page before attempting to clean your object.

Cleaning gold and ormolu (see below) should be limited to gently dusting with a soft brush. If the surface is discoloured, use a swab moistened with methylated spirit and rub gently. If this doesn't work, try a swab moistened with spit, followed by a swab moistened with distilled water.

Warning: some gold objects, especially from the Indian subcontinent, and parts of Asia, have intentional deposits of reddish material in low areas, used to enrich the appearance of the metal. Natural substances such as tamarind seed were used and can be mistaken for residues of polishing compounds. If in doubt, consult a specialist before cleaning.

Ormolu

Ormolu mantle clock, about 1860. Museum no. M.75-1980

Ormolu mantle clock, about 1860. Museum no. M.75-1980

Ormolu is the term used to describe gilt brass on decorative art objects from the 18th and 19th centuries, for example gilded mounts on furniture. The gilding was applied using the mercury amalgam process, sometimes also called fire gilding. Copper corrosion products can form on the gold surface through minute gaps in the gilding.

The traditional method for 'cleaning' ormolu was to brush or dip the ormolu in an ammonia solution. This was very effective for removing copper corrosion products but unfortunately ammonia also attacks the metal itself. Ammonia 'cleaning' often left the surface slightly matte, so dipping was followed by polishing to restore a bright shiny gold finish. The first treatment with ammonia often produces rapid and spectacular results. Repeated treatments, however, damage both brass and the gilt layer. Eventually all gilding is destroyed and even the brass becomes etched and dull, leaving a once attractive and valuable piece almost worthless.

Ormolu should be cleaned in the same way as gold. As with silver gilt objects, the gold layer is thin, soft and easily polished away. Small black spots can often be seen on ormolu. These are typically very hard and difficult to remove without damaging the gilding layer. Chemical treatment is needed to remove 'black spot', so consult a conservator.

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Gold Feather Headband by Colette Malouf

Gold Feather Headband by Colette Malouf

This Feather is hand cut and meticulously hand embroidered with fine metallic threads. This Headstrap is made with adjustable stretch velvet ribbon th…

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Event - Personal favourites: Gold and Silver from the Rosalinde and Arthur Gilbert Collection

Sat 01 November 2014–Sat 24 October 2015

DISPLAY: Superlative silver was the first area in which Sir Arthur Gilbert (1913-2001), one of the great collectors of the twentieth century, collected. From the 1960s onwards the London-born Los Angeles property tycoon sought expert advice, but also made some idiosyncratic choices.

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