is the brass still good if the cases came out pink?
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The cases look fine. I think your solution is mildly acidic which reacts to the tarnish and turns pink.
I had obtained some buckets of fired military brass that had been poorly stored. Many shells were blackened with tarnish.
I have used several different chemicals to try to get rid of the black tarnish:
ZUD cleanser which contains oxalic acid. Works pretty good if you can find it.
Vinegar which is acetic acid
Lemon juice which is citric acid
Commercial bathroom cleaner which contained phosphoric acid.
In all cases, the tarnish does turn a pinkish color. But that pinkish color polishes out nicely in a dry tumbler.
Really black tarnish is virtually impossible to get rid of.
Shells that have really black tarnish spots that will not come off are physically weak and will develop a crack when reloaded and fired.