Yet, some silver solder alloys additionally contain cadmium. Cadmium is a toxic heavy metal that can actually knock a naive user out, so opt for zinc or nickel alloys instead. Ideally done outside.

Solder is a metal alloy used to join metals together ... Sn/Pb solders have generally disappeared from plumbing applications in favor of silver alloys, but remain in use in electrical and electronics ...

Most of these alloys were combinations like copper-silver or silver-gold and used with so-called hard soldering. That’s a technique still used today to join precious and semi-precious metals ...