Soaking my bong bowl piece in rubbing alcohol made the paint turn the liquid purple and when I used a pipe cleaner the paint chipped off lol?

I soaked the bowl part of my bong in rubbing alcohol and the paint came off making the rubbing alcohol turn to a purple color. Then I tried cleaning it with a pipe cleaner and the paint started chipping. Did I do something wrong, or did I purchase a bad bong?
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