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[TowerTalk] Black on Cu

Subject: [TowerTalk] Black on Cu
From: Nick Pair <>
Date: Sun, 3 Sep 2006 22:16:39 -0700 (PDT)
List-post: <>
The black is copper oxide and a poor conductor. Most common form of copper 
degradation. Can form deep under insulation on coax and other insulated wire. 
Resists soldering very well.
  If the color on the Cu is a light to dark greenish blue you have copper 
sulphate. A common mineral in many places and a very good chemical to get rid 
of any mold, moss, or lichen on your roof. Also sometimes seem around Cu wire 
near your cars battery as battery vents when they get older and internal 
resistance rises. Not very common on antenna wired unless you live near a pulp 
mill that still uses the sulphite process once very common in northwest.
  Either of the products is depleting the copper in your wire. The oxide is 
generally removed with a dilute acid and the sulphate with a dilute base.
  FWIW   neither is detrimental to signal but both to antenna life.

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