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I don't think it was from the paper. On the windings it was patchy and seemed
to be coming in from the edges.
Another symptom was that it was impossible to solder to the lead wires using
just solder and flux! Period. No matter how hard I tried. There was some sort
of coating that resisted heat so well that even my hottest soldering iron
setting and liquid flux could not beat it. It had to be scraped off. A sulfide
would dissolve in flux.
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