Hi

I made a 9ct gold cast ring from scrap 9ct gold, I melted my filings and scrap I had left over after finishing the ring, and it weighed 21.01g. I then noticed I had some good left in the borax in my scorifier, so I melted the 21.01g back into it to pick up the rest of the gold.

I then weighed it again and it was 20.48g. what I assume is that some alloy metals in the 9ct were oxidised and were removed by borax?

If my assumption is correct, would that mean that I now have a slightly higher carat bullion?

Thanks