which zone of a flame does a goldsmith used for melting gold and silver and why
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A goldsmith uses the non-luminous zone (outermost zone) of candle flame to melt gold and silver because it is the hottest part of the candle flame and has most temperature.
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The outermost layer of flame is used by a goldsmith ti melt gold and silver as the out of all the 3 layers the outermost layer is the hottest thereby helping in faster melting. Also the colour of this layer is blue due to its contact with oxygen.
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