I should know this after decades of casting but never ran across the issue before, guy at the range about 10 years ago gave me a dozen sticks of "tin", finally got around to looking at it, sticks are about a foot long and about a pound each, (8) are marked "Taramet 50% Tin", the other (4) are marked "Federated Cast-Omatic Solder 50/50", I am assuming the "other" 50% is lead, correct?
I have also heard that solder is impregnated with an acid to help with the soldering process and so not good for making bullets, old wives tale or true?
TIA