Hi everyone. I have a batch of HCL and Peroxide used on gold plated jewelry material and I have gold with a black powder forming in the bottom. I'm not sure if it's silver chloride or something else forming. I took a small sample and tried dissolving with nitric acid after washing five times with distilled water and it seemed to dissolve some and cement some other parts in the bottom with the gold remaining. I was also able to melt a small portion and it is a silver color metal but very brittle when hit with a hammer. I did a silver acid test on the small metal melted piece and the acid was coming back light blue. I did a small aqua regia batch with this same stuff in it and it remained a grey sludge in the bottom of the beaker. Any ideas as what this may be or how to recover the gold properly? Thanks everyone for any help with this topic. - Matt