How to Care for...
Pewter Objects
Introduction
Pewter is a rather vague term. Nowadays it refers to articles made from an alloy containing about 90% tin, the remainder being a mixture of antimony and copper. In earlier times, pewter could be any of a wide range of alloys of tin and lead, with the addition of small amounts of other metals such as bismuth and antimony. It is a material that is easily cast and machined. It maintains a fairly stable surface. Modern tin pewter has a bright, silvery sheen and is quite distinct from earlier alloys, which are usually dark grey.
Cleaning
Polishing is not normally necessary for pewter objects because they develop a stable patina. However, the bright, silvery coloured objects may show the effects of handling, which may make the surface look mottled and unattractive. This can be removed by rubbing with a wadding metal polish (cotton wool or batting that contains an abrasive and is moistened with an organic solvent) followed by rinsing in warm water. Ensure that there are no hollow parts in the design where water might become trapped. Polishing old pewter is more problematic. Firstly, the deep grey patina is very desirable aesthetically, and secondly, there is no guarantee that the surface will be improved by polishing. Occasionally, old pewter shows spots of local corrosion in the form of small warts or pits. In this case, seek the advice of a metals conservation specialist because the surface can be damaged by attempts to treat this condition.
Handling
Old pewter may contain high proportions of lead and other toxic metals. It should be handled with clean cotton gloves and not used for food or drink. All pewter objects are soft and thus very sensitive to denting and scratching. Using cotton gloves will prevent scratches made by rings, bangles and watches, and also protect the surface from the oils and salt on the skin. If an object has been handled with bare hands, it can be lightly swabbed with rubbing alcohol.
Display and Storage
Objects on display should be protected from accidental damage. Even moving during regular dusting can cause small scratches and dents that build up over the years. A glass or acrylic-fronted cabinet will minimize the amount of dusting needed. Objects in storage should be wrapped in soft, well-washed cotton cloth and kept in a box to avoid accidental damage. Avoid using wooden or cardboard boxes because some wood products produce acidic vapours that can cause old pewter to corrode.
