Is there anyone out there with experience in refining.800 and .925 silver using acid? I have studied YouTube and the WWW but I was just casting a net here. I was really looking for someone in the SE London area that was willing to hold my hand on the subject. I have a ceramic chip forge for the smelting it was the chemical side that frightened me. I have access to all the glassware and a vacuum pump. The things that worries me is the weight to ratio of the chemical, copper and silver etc. Looking forward to seeing if anyone can help.