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. Parts of the coyote skull where thin and delicate so I used modeling clay to make those parts thicker prior to creating the mold.

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The Cerrotru alloy I used has a very low melting temperature so I was able to melt it all with a plug in hot pot.

Links:

Cerrotru Tin + Bismuth Alloy:
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Melting pot
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Mold Max 60 catalyzed silicone rubber
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Best Glue Gun Ever!
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Modeling Clay:
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