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I have followed this thread as well as the subject of fire scale
for some time, have read the subject several times and work with
silver 65 percent of the time. My current understanding is that
fire scale IS NOT the black appearance on silver after casting.
That it is in fact a black color imbedded in silver item which
cannot be removed by a light abrasive or polishing.... If this is
true, then I'm finally doing something correct because I have
never had the problem!!!
I puddle the silver, pour Borax on the puddle, lightly swirl the
mixture, pour ASAP. Don't know if this has any bearing but ...
that's it! . . The way I was taught??? Think the Borax pulls the
"floating crud(technical term)" on the silver puddle surface to
the bottom of the casting container.
Jim
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