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Posted by beecrofter on May 12, 2008, 9:57 pm
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> I had to silver-solder two small components together today. To get a prope=
r
> solder flow I had to apply heat directly to the part of one component that=
> will later be visible. It ended up covered with black gunk. Is this what
> they call firescale?
>
> I tried removing it with steel wool with only partial success. In the end =
a
> judicial application of 400 grit sandpaper did the trick without
> obliterating the pattern underneath.
>
> If this is firescale I understand Sparex (sodium bisulphate) is the thing =
to
> clean it. Am I correct?
>
> --
> Michael Koblic,
> Campbell River, BC
Next time cover everything with white (borax) flux to keep the air
off, but now try soaking the piece overnight in water and seeing if
any of the crud loosens.
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