Badly carbonized brass

After soaking some more cases in vinegar all the black disappears and the cases come out very shiny, that is until they dry out and then morph into the dullest dull you could ever imagine, but then a little dry tumbling reverses the dullness back to the nice shine. However this is not a process to do routinely but just for experimenting to see what works.
 
I opened a new box of unfired Winchester Winclean 9mm ammunition that had been in storage for five years and packed in styrofoam inserts. About one quarter of each round, 90 degrees vertical circumference, was heavily covered with the black coating. It appeared that the rounds had been leaning against the stytofoam at the blackened location, now leading to the conclusion that the blackening is caused by some chemical reaction with the styrofoam.

As previously pointed out this discoloration is difficult to remove whereas normal carbon black is generally easy.
 
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