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Which zone of a flame does a goldsmith u...

Which zone of a flame does a goldsmith use for melting gold and silver and why ?

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The goldsmith uses the outermost zone of a flame with a metallic blowpipe for melting gold and silver.
The flame in the outermost zone has the highest temperature sufficient to melt the gold and silver.
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Goldsmiths blow the outermost zone of a flame with a metallic blowpipe for melting gold and silver . Why do they use the outermost zone of the flame?

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