I have been lost wax casting for a year now and I have not been able to wrap my head around the casting limitations of 14K gold. I am referring to the rule that you can only cast with a precious metal (in my case it is 14K gold) two times then you have to add at least 50% new gold to the mix to avoid porosity and heavy darkened film (not sure what this is, its not firescale/firestain but a dark orange color and a huge pain to get off when polishing).
My issue is now all my cash is tied up into my old gold that cant be casted anymore (already casted it 2x or more) and I cannot afford to buy new gold for upcoming orders because all my money has been casted into gold sprues, buttons and casting trees. What do people typically do to be more efficient and economical with casting gold?
I have seen those “gold refreshers” or a special additive to get more casting out of the gold. Are these reliable and can you still make the claim for 14K purity? Or is there a way for me to refine the old gold myself to yield more castings?