Ben wants to cast a bronze dagger for some reason, and since we believe in encouraging stuff like that, I got some casting sand, a cuttlefish bone or two, and we gave it a try. We did a arrow or javelin point first and tried both a simple tin-copper bronze and a silicon bronze.  Since the forge running full out melts copper easily, we figured "no problem." Here's the stuff in the forge:

We tried melting both but the silicon bronze did strange stuff, like evolving sulfur and maybe silicon - some white fiber like stuff. So we melted a cup of pot melt instead. The cuttlefish bone mold for the arrow head didn't fill but the anvil and sand mold did just fine.

Cleaned up, they looked pretty good. I was surprised at the detail in the sand casting. You can see the sandpaper marks...
 

The anvil about the size of a nickel and the arrowhead is about 2" long. Now we need a larger crucible and more tin. Copper is easy to find but tin is not locally. Next we doing a 12" bronze age dagger.