La fusione dei metalli - Milady Gioielli

The fusion of metals

The technique of melting precious metals has been around since ancient times and has proven to be very useful for the manufacture of jewellery.

Each metal has its own melting point. Gold melts at a temperature of 1,064° and occurs in refractory crucibles and is poured into special molds. Today, to make small objects, a torch that emits particularly energetic gas is used. In this case, the melting operation is carried out on a refractory plate or in a small crucible.

Silver is always melted inside refractory crucibles, inserted into furnaces at 962°. The melting temperature is precise; in fact, an excessive temperature could cause the melted silver to swell inside the crucible. The molten metal is then poured and cooled. To make it more stable and workable, it is alloyed with copper. One of the best qualities of silver is Sterling, which has a ratio of 925/000, that is, it has 925 parts of silver to 1000 parts of metal.

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