What you all have to understand id your seeing oxidation based on teh reduced surface tension allowing the oxygen to get to the metal much faster. If you look at old churches, the reason they used copper for the roof if because they WANTED the copper to turn green. This layer of oxidation was the best and li=ongest lasting protecting material around. The same thing goes for AL.
The black is an oxidation. This will be your barrior inside your system against oxidation at a further level.
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