I agree pippin88. Honestly I'm not really concerned about some scarcely perceptible oxide on my copper components. It can't be effecting performance much.
Case in point, that Swiftech block all rainbowed with oxide from brazing. A splash of pickle would have cleaned it up, but apparently the oxide is immaterial, or doesn't effect performance enough to justify a cleaning. So if that's true then surely there's no point trying to slow lesser tarnishing with a sacrificial anode.
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