Eager newbie "silversmith" (term used very loosely) back with another naive question begging to be skewered or helped.... =)
I start out with verified sterling or .999 and take care to prevent contamination during casting. When complete I have at least a button left over and sometimes a partial cast for the scrap pile due to incomplete burnout, poor spruing and the like. Assuming the contaminates could include residual investment material (SatinCast) and possibly wax that didn't completely vaporize. Shouldn't be much else, maybe some carbon from the floaters MAPP gas sends in the air.
So the question is what processes do you guys follow to re-use the metal. I read a book that basically says re-use it mixed with "fresh" which makes sense when it comes to sterling, maybe not so much with pure. In sterling I understand you lose some alloy but I wouldn't think that's as much of a concern as outright contamination of pure silver would be.
I had a couple ounces of buttons I put in the crucible and melted down to create shot but I wonder if there is minute particles of SatinCast or other contaminants still in there I should be concerned about. And what procedures you guys/gals follow.
Thanks for any pointers.
- Ben