[Robin] starts with a demonstration of just how far a little bismuth depresses the melting point of tin solder — to about 135°. That allows plenty of time to work, and freeing leads from pads ...

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I made a catalyzed silicone rubber mold using a Coyote Skull and then poured a molten metal alloy made out of tin and bismuth. The result is a 5lbs solid metal skull doorknocker.