Like I said in the subject line I'm not sure where I got it from and if it contains silver or not. I remember in the past I did buy some of this stuff to see if it was worth processing but it had gold on it. I can't remember if I bought this thinking that there was silver on it. It was a few years back. So I'm doing a few mylars and I'm wondering if I could do this with the mylars as well. Any advice is appreciated.