you need forced precipitation? add sodium hydroxide, add more and more until theres no reaction then filter all precipitation with filter paper, then wash it with hot water or boil it, then alway allow all precipitation to settle down then dissolve again with aqua regia, this aqua regia do not mix directly 3:1 ratio, add hydrochloric acid its enough to cover, then add slowly nitric acid, so that is not difficult to precipitate using smb.
I have a lot of material and it's difficult for me to make a good forced precipitate of gold. I even knock it down with aluminum from aqua regia, but then my chloride in the melt even after being washed  Traduzir uma conversa
