Hello!

I'm very new to all this.
It all started when I got the mad idea to sand cast my own wedding rings in 10ct gold. (we're getting married next week)
One has turned out brilliantly, the other...

I'm looking for help.

I have 10g of 10ct yellow gold that has somehow fused with something in the furnace, and now all I have is a crucible full of a ridiculously hard, black glassy substance.

I have spent an hour this evening heating it with a blowtorch, and I can see the gold melt and glimmer, but it just won't pour and can't seem to escape this resin-like stuff.

Since doing that, it has now turned a deep reddish colour...like rosarita.

I am both baffled and desperate for help, as this Friday is my last opportunity to use the furnace.

I heated the gold grain with a sprinkle of borax powder in a lab furnace at around 1100°C for around 10-15 minutes.
The first time it poured, but the casting failed, so we re-melted it, and all hell broke loose.
Now, I cannot get it out of the crucible.

If anyone can advise on what has happened and how to fix it, I would be eternally grateful.
Many thanks