Sal Ammoniac Solid Form ~ Johnson Mfg. ~ 4 ounces
Instructions for tinning soldering irons: Heat soldering iron to soldering temperature. Using iron, melt a small droplet of solder onto the top surface of the Sal block. Rub heated iron across the surface until all sides are brightly tinned.
Also use to clean carbon deposits from soldering iron tips.
Block measures 2.25 X 1.75 X 1.33 inches and shows larger than actual on my computer.