Category:Detail of Rear Screw Hub Face

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Photographs in this category reveal close up details of the end face of the rear screw. The greenish layer under the a.k.a 'white adsorbates' is anti corrosion base coat which is presumed to be a sort of zinc-chromate primer or a coat of the same kind made up by chemical treatment. There are tiny bubbles too. This means that there were ongoing corrosion activities under the surface thru cavities or cracks as of the day these photorgraphs were taken.