Question

why the blacksmith uses the outermost zone of the candle to melt silver and gold

Answer 1

because the outermost part of flame is hottest part of flame that is why blacksmith uses the outermost zone of the candle to melt silver and gold

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Answer 2

The outermost part of the fame of the candle is more hot than the flame itself. Thus the will melt fast because more heat is supplied to it.