I have a few spools of tin wire solder that I add to my WW's for fillout. Then I have 3 spools .. two of them say tin with copper and one says contains tin, copper and selenium. Will the copper or copper and selenium affect the alloy of the boolit, or are those in such trace amounts that they are negligible. Why do they add copper and selenium to tin wire solder ??
Ohio Rusty ><>