Original poster: "Gerry Reynolds" <gerryreynolds-at-earthlink-dot-net> Jack, you might try to polish it with steel wool or Braso. Gerry R > Original poster: Phlunktfysics101-at-aol-dot-com > > My copper primary is starting to oxidize and become discolored. If I > varnish it, will this effect coupling? > > Thanks! > Jack