It's an easily workable metal, and apparently the easiest way to seal the hole made when they empty the vacuum chamber and / or produce certain welds. https://

It's an easily workable metal, and apparently the easiest way to seal the hole made when they empty the vacuum chamber and / or produce certain welds. https://www.wired.com/story/stanley-cup-lead-soldering/ https://www.wired.com/story/stanley-cup-lead-soldering/