So I have a friend that gave me a lot of brazing paste scrap. It is 82% gold and 18% nickel 100 mesh. When I look into a microscope the powder making up the paste is tiny little balls. I'm pretty sure the gold and nickel are fused together in each little ball instead of being separate like I thought. My question is: is aqua regia suitable where nickel is involved. And is aqua regia the only way to seperate the two? I have been doing research on this for a month. I've ordered everything I need to do the aqua regia refinement along with a homemade hood vent that sucks everything out and away from me very well. Should I have some sort of filter where the vent exits my garage? If so what kind? I want to make sure I'm doing this as environmentally friendly as possibly and I'm going all out. I downloaded Hoke's book and will continue to educate myself until I'm fully confident with everything. I have a lot of gold and don't want to waste any of it. Thank you in advance for any advice!!!