Back in Jr. High (mid-50's), in metals class, we had a block of a white substance that you rubbed the heated soldering iron on to prepare it. I remember lots of smoke. What was that stuff ? TIA....
the material you are refering is " salamoniac". i think it is basicly ammonium chloride and zinc chloride. i sure someone on this board more knowledgeable than me will confirm or deny this.
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