I recently acquired an R-4A that has some tarnishing and corrosion on
the copper chassis. Not real bad, but it's kind of spotted like a lot of
Drake chassis. Anyway, the back panel was kind of black along the bottom
edge, maybe the bottom 1/4" width or so. The only thing that would
remove the black was steel wool, probably because it was under the
lacquer, and it only came off after removing the lacquer.
Now the black discoloration is gone, but the bottom 3/8" or so of the
back panel is brighter and shinier than the upper part. It's a little
pinkish and bright, kind of like a polished penny. The rest of the
chassis is a little more orangy, for lack of a better description.
Does anyone know of a good way to darken the brighter and shinier part
of the chassis without having to wait years? I plan on clear-coating the
whole back panel after I get the whole thing to look more even.
I found several articles online with methods to darken and tarnish
copper, but none of them did anything when testing them on a piece of
copper sheet metal.
Thanks,
Al, WA2S
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