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Sterling Silver Wire: 925 Silver to 75 Copper, Cast and Drawn
Sterling silver is 925 parts silver to 75 parts copper. Fine silver alone is generally too soft for working objects, so it is alloyed with copper for strength (Wikipedia, Sterling silver). Melted together, cast in a bar and drawn down through a drawplate, it becomes wire.
The picture: a silversmith drawing silver wire for jewellery, Trinidad, 1930s.
高级
A day
说明
1
1
Weigh
Weigh
Weigh fine silver and copper in the ratio 925 to 75 (see the notebook).
此步骤所需材料：
纯银92.5 克
铜锭7.5 克所需工具：
等臂天平2
2
Melt and cast
Melt and cast
Melt the silver in a crucible with a pinch of borax, add the copper and stir until one even liquid, then pour into a warmed ingot mould as a thin bar.
此步骤所需材料：
硼砂粉1 as required
木炭1 as required所需工具：
石墨黏土坩埚
木炭坩埚炉
坩埚钳
锭模
耐热手套3
3
Draw the wire
Draw the wire
Hammer the bar round, file a taper and draw it hole by hole through the drawplate, annealing to a dull red with the torch whenever it stiffens, as copper wire is drawn.
4
4
Weighing sterling
Weighing sterling
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