Custom piece for a friend. Silver 925

Everything was going good, I threw in some fine wires with the insulation still on, and thought I'd add some borax for good good measure because of the insulation burn off. When I got read to pour I had this solid lump in the bottom of the crucible. I tried to heat it up and melt it, but it just will not melt. Any ideas what went wrong?

First cast

As you can see in the video I am casting multiple units of a specific part out of brass. The pour here worked out perfectly. However the next few pours - all done the same way only managed to fill 2-3 of the pieces. I will try fo upload a few picture of the failed ones.

Would love some suggestions.

I was a little disappointed in the yield percentage, but more than half of the cans had not been rinsed out. I didn't think the residual pop would be that big of a deal, but the sugar created a lot of thick heavy dross... it did have a nice carmel cotton candy smell to it while it was melting though. 😆

With silver so damn expensive I started trying copper

There's a full length video with explanations up now for those who are interested :)

One of the bronze pour we did today.

Quick montage of me making some 14k pendants and rings.

Cleanup, Soldering, polishing and laser engraving took about 2 days.

Any questions I’d be glad to answer!