That looks like silver oxide to me. It is conductive, so should not
pose a problem.
On 8/2/2015 1:06 AM, Wes (N7WS) wrote:
If you want to see intermittent connections...
https://groups.yahoo.com/neo/groups/Elecraft_K3/photos/photostream/lightbox/692485818#zax/2040317344
Note: The connection is purposefully disconnected to show the
corrosion inside the socket.
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