Metal Silver
How to Use Precious Metal Clay in Jewellery Making
Precious metal clay (brand names are PMC and Art Clay) is modern-day alchemy. PMC is a clay base with tiny pieces of silver suspended within it that, when heated, burns off the clay leaving a solid silver residue. The clay base acts as a binder for the metal particles. Once this has been removed, the remaining silver particles bind together, giving you the finished product.
The real beauty of precious metal clay is that it can be manipulated like any ordinary modelling clay, making it perfect for jewellery making. The modern precious metal clay can be using a jeweller’s torch, as the firing temperature is much lower than the early versions of this clay. However, a small kiln will produce a much more constant temperature range and can be controlled exactly, meaning that the results will be more consistent.
Precious Metal Clay once had a very bad reputation for shrinkage, making it unsuitable for fine work or detail. Modern precious metal clays have a much lower shrinkage rate (around 10-15%), but you still need to factor this into the final piece to ensure that really fine detail is not lost in the firing process.
Once fired, the silver piece will seem very lacklustre and dull, so it will need finishing. The dull matt surface hides the real beauty underneath, so finishing and polishing will reveal the shining silver below. When soldering finished precious metal clay pieces it is essential to remember that the surface will be more porous than standard sterling silver, so it is best to burnish the piece prior to soldering. But because it is almost pure silver there is little risk of fire stain on the surface and the final results are almost indistinguishable from sterling silver.
Because precious metal clay is a clay, it takes impressions very well. A design can be pressed onto the surface of the clay and be revealed in the final silver piece. Patterned rollers, lace or even leaves can be used to create unique effects that are difficult to reproduce in ordinary silver unless it has been cast. Precious metal clay is a popular way of making silver beads. The clay can be formed into beads, decorated with a surface pattern and then fired in a kiln quickly and easily, producing high quality silver beads.
Safety considerations have to be taken into account when working with precious metal clay because of the high temperatures required to fire the clay. A small enamelling kiln allows you to safely achieve the temperatures required for optimum results, but ensure that you have all the correct equipment such as tongs with heat resistant handles to extract work from the kiln safely and a heat-proof surface upon which to work.
Precious metal clay is an ideal medium to work in if you want to create pieces of silver jewellery that are unique to you. The only thing that limits you is your imagination. Precious metal silver clay is widely available from good jewellery equipment suppliers. There are two main brands – Precious Metal Clay and Art Clay Silver. The clay is also available in other metals including gold, but the cost is significantly higher than the silver clay.
About the Author
Adam Hunter – E-commerce Marketing Manager of cooksongold.com. Cookson Precious Metals offer a choice of
jewellery making
supplies from over 10,000 products including gold and silver jewellery findings, tools,
precious metal clay
, and gold and silver sheet. Contacts Adam Hunter E-commerce Marketing Manager Tel(DDI): +44 (0) 121 212 6491 E-mail: adam.hunter@cooksongold.co.uk
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Jewelry | admin | 
January 30, 2009 9:41 am | 
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