Ok, so I'll keep using my old solder, and buy the new stuff next time I need more solder. (Unless of course, someone gives me more of the old stuff before then,

Ok, so I'll keep using my old solder, and buy the new stuff next time I need more solder. (Unless of course, someone gives me more of the old stuff before then, in which case its best to use it, and keep it away from the landfill)