(tried to post as a second edit, but broke the 1K limit)
I don't understand what you're saying about "good" lead containing tin and silver. It's true that tin is ubiquitous in solder, and silver not uncommon (especially since RoHS), but all specific references to lead in solder are to just that - Pb.
I don't understand what you're saying about "good" lead containing tin and silver. It's true that tin is ubiquitous in solder, and silver not uncommon (especially since RoHS), but all specific references to lead in solder are to just that - Pb.