I've done some searching around here but not really found the answers. I have run out of investment for jewelry casting I see here that some of you make your own This is interesting because the cost of shipping doubles the cost of the stuff. So I find that 50/50 sand plaster mix will work but I see also that some say 30 mesh silica sand ( Lowes has no idea what I'm talking about) and some say brick sand is fine. Is that the same as costurction sand or is it sand box sand?

I'd like to know more about copper casting if anyone can fill me in. I have a few days of reading behind me and no experience.

I recently got a kiln dirt cheap and would like to try out sand casting using pure copper. I just wanted to know if anyone here has tried this?