Long ago, when I was a puppy - I vaguely remember using these two
chemicals. We used to put a pinch of ammonium chloride on top of the
molten alloy to “toughen” the resulting alloy, or a pinch of
potassium nitrate to “clean up” dubious scrap metal.
I cannot remember if this was explained to me, or why it seemed to
work. I do remember that it had to be done under a ventilating hood,
because it would produce nasty smelling smoke.
Does anyone out there know whether there is a scientific basis for
this? Or whether it is indeed, useful? It seemed to me that one or
the other treatment helped make rolling some alloys easier… less
tendency to crack…
Brian P. Marshall
Stockton Jewelry Arts School
708 W. Swain Rd.
Stockton, CA 95207