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Why pure gold melt at 300 degree celcius

The actual melting temperature of gold is 1000 degree C. But I noticed when pure gold wire whose diameter is 3 mills is put into the molten blob of solder (60% tin + 40% lead) which is at only 300 degree C, the gold melts and alloyed up with the molten tin.

How the tin lead alloy reduce the melting temperature of gold?