Question

why do goldsmiths blow the outermost part of the flame to melt gold and silver

Answer 1

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━━━━━━━━━━━━━━━━━━━$\mathfrak{\green{Answer.}}$Goldsmiths blows the outer surface because it is the hottest part of the flame and undergoes complete combustion. It is also called as Luminous Zone. ... Combustion means burning or any chemical change that produces heat and light.During this process hydrocarbon reacts with oxygen to produce carbon dioxide and water.
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Answer 2

Goldsmiths blows the outer surface because it is the hottest part of the flame and undergoes complete combustion. It is also called as Luminous Zone.

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