All I ever do is e-scrap. The "blue-goo" is actually metastannic acid, or tin paste. What I mean by thinking that my gold foils (flakes) might burn up if I incinerated it, is that I have melted gold foils with a torch before, it being so thin. So I know it can be incinerated and possibly blown away. This is the first time I've ever seen my gold disappear in a muriatic hot wash. But I've cleaned up the blue-goo this way many times before. When all you do is e-scrap you get blue-goo alot. Now, I know my gold is in that muriatic, in that there jar. I know it's there. I just can't see it and I don't know how to get it to re-appear. Enough to filter it, anyways. I'm going to take a little of it and try diluting it a little and try some SS on it. We'll see if that works.