So I have some braze paste that is au/ni. I did my first batch which yielded the solid gold in the picture. I know I had too much metals and not enough chemicals. I filters the leftover chemicals which is the gold colored material in the jar in the picture. The material in this jar, is that mostly gold? Does Ni dissolved faster or would it change color? I did this first batch with hcl and increments of nitric over low heat and I yielded the piece of gold in the picture. My second batch I did the same thing over medium heat and even let it work longer but I ended up not yielding anything except some minute brown particles after dropping it with SMB. So my question is, does too much heat make the AR not dissolve enough. I will say, as a beginner and my first couple times I did rush the job and only had 4oz of nitric which I split into 2oz for each batch. I know I didn't have enough. When I do this again I'm going to make sure that I order everything I need along with making a fume hood. So with all that said, how much heat should I use? And the leftover material, is that mostly gold or is the nickel still present and just changed color? Will and pure nitric bath dissolve the nickel leaving the gold? The grey powder in the picture is the braze paste before putting it into AR. Also, is there anything better to use to precipitate the gold other than SMB or is that the best to use? And where can I buy the stuff to make strenuous chloride test? I found tin shot on Amazon but dont know where to get the Crystals.