why the Goldsmith mixes a small quantity of copper to pure Gold ?

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Goldsmiths and Jewellers add copper (often) or silver (rarely) to gold when making jewellery. Copper is melted together with gold to make an alloy, which can then be beaten, drawn or twisted into various patterns. Gold isn't good for jewellery. Pure gold is a very malleable.
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Home Tutor

To increase the strength of gold ans to mould it as required
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Physics Wiz

To increase it's tensile strength. Pure gold is very soft though so it will break by small force.
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Medical CSIR NET LIFE SCIENCES

to make ornament ... pure gold cannot be molded with a proper shape.
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proffesional trainer

To increase the strength of gold ans to mould it as required
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Biotechnologist

It increases the hardness of gold .otherwise it is highly impossible to make ornaments of different designs
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according to Hume Rothery rules , higher valance metal dissolves the lesser amount of lower valance metal and vice versa. this is the reason for this question
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Copper and silver have about half of the density of gold. While they can be beaten into sheets, it needs more force and strength. And they're also much cheaper than gold. That's why goldsmiths and jewellers add copper (often) and silver (rarely) to gold when making jewellery. Copper is melted together...
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Copper and silver have about half of the density of gold. While they can be beaten into sheets, it needs more force and strength. And they're also much cheaper than gold. That's why goldsmiths and jewellers add copper (often) and silver (rarely) to gold when making jewellery. Copper is melted together with gold to make an alloy, which can then be beaten, drawn or twisted into various patterns. read less
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