Stay Brite Solder w/Flux Stay Brite Solder should be used with a soldering iron or torch. This is a silver bearing solder that flows at only 430 degrees, making it an excellent choice for use on Silver, Pewter, Nickel, Copper, or almost any other metal. Stay Brite Solder retains its' bright, shiny look even after hardening. Flux: .5 fluid ounce