I have a couple of round solder ingots from when I bought an older fellow's complete casting setup, one is 5 pounds and is marked "N-F Lead" and "Non-Ferrous Metals Inc, Seattle", the other is 3.5 pounds and is marked "N-F Metals" and "Extra Wiping Solder". Does the "N-F" indicate a specific ratio of lead to tin? And is there anything usually alloyed in with this stuff that should not be in boolits?
With the cost of tin being what it is , would be nice to be able to use this stuff.