Was: how much cracking is normal
I recently made a post regarding my cracking gold. I am 99% certain that it wasn’t my copper source, I.e my copper was pure enough and it wasn’t an issue with impurities. I know this for a few reasons, one is that I also used it in green gold which experienced no cracking compared to the yellow. If the copper was impure I believe the green gold would have suffered the same problems though correct me if I’m wrong. Also the seller (rio grande) sold this wire as .999 pure copper. I re-poured both ingots and rolled some high quality wire. The difference this time was I forged them first. I never forge my silver and usually don’t have problems but it seems that gold is MUCH more prone to developing grain structure issues than silver which I highly suspect was what was causing my gold alloys to crack when I rolled them. It cooled very fast in the mould and probably had some dissolved oxygen among other issues all which could have caused cracking. By forging it seems I’ve alleviated these stresses and gotten workable metal although it certainly took gentler passes and more frequent annealing than silver.