I have been collecting silver bullion and though it is only bullion I really wanted to keep it all in as good a condition as possible. I have a coin storage case, and within that have been using coin capsules, silica gel and anti-tarnish paper tabs. I was looking at my coins today and noticed this on a couple of the QB's, it's only on the sides. Can someone tell me if this is milking and if so what the hell I'm supposed to do to prevent it which I'm not already doing? I rubbed it with my finger and nothing was coming off.
Thank you.