dann2 - 24-6-2007 at 12:48
Hello,
I am wondering what is in this stuff.
http://cgi.ebay.co.uk/Broken-tap-remover-Emergency-work-reco...
Dann2
Eclectic - 24-6-2007 at 13:01
I don't know about that particular compound, but ammonium or sodium persulfate would work on aluminum, you might want to use just alum, sodium
bisulfate, or sulfuric acid on brass or copper. The persulfates would etch copper and brass, sulfuric acid and sodium bisulfate would probably attack
brass.
12AX7 - 24-6-2007 at 14:18
One remedy I heard was boiling in alum. Apparently it's acidic enough. Another is nitric or sulfuric acid, which obviously work best on aluminum.
Sulfuric, or, yeah, a bisulfate, is the best bet here.
Tim
Rosco Bodine - 24-6-2007 at 14:41
sulfamic acid would be my guess