I have some 24K gold coins that I want to reduce to 14K and some to
18K. I will be working with small amounts and am considering pouring
the molten gold into a shallow depression in a charcoal block,
rather than into an ingot mold.
I will be using a new, freshly prepared crucible to avoid any
contamination of the metal.
Also, I will be using rolling alloy, as I will not be using the
alloyed metal for casting. I have the charts giving the proportions
of gold to alloy, and will be careful with my measuring.
However, after consulting various sources on the internet, I have
become quite apprehensive about doing any alloying as I understand
that there are a number of problems, such as brittleness, cracking
of the gold when it is being rolled, as well as spots and other
impurities contaminating it. Also it must be properly quenched before
it has a chance to cool, but no as to how long to let it
cool before quenching.
With all these dire predictions, I am beginning to wonder if I
should forget doing any alloying, and just trade the coins for some
sheet metal, in which case I would be losing money on the exchange.
Am I being unduly fearful of the undertaking, or should I just
proceed to do my own alloying.
I will appreciate any suggestions and advice.