IIRC, Viborg uses what they call red copper, which is probably red brass - a high Cu content brass, quite a bit harder than pure Cu. Visually and under a few strokes of a metal saw (I wanted to check if this is not a plating) behaves indeed like a 'hard copper'. I protect the surfaces I can reach using Paul's method (I 'hate' you for that Paul, takes so much time): jewellery polish (me by hand) - isoprop cleaning - dielectric grease (silicon based DC-4)
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