Lead solder is neigh impossible to get, and ususally you have to get it at a
supply house as many common hardware stores don't or won't carry it anymore,
I've had the same small roll of lead-based solder for about 12 years now in
my toolbin, and only used it twice for non-water applications.
While most solder does contain a small amount of lead this IS the same
solder used in welding copper pipe, that you drink out of. So i would not be
too concerned about dry lengths of solder lying around. Most plumbers find
all sorts of uses for dry solder as the parent poster stated and they are
not dropping like flies. At least not from lead poisioning anyways.
-Rip, who speaks only of plumbing solder and not electronic fluxcore solder.