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You must understand that красный meant beautiful in old Slavic and that wiki article you provided even mentions that. Only later the word shifted it's meaning to red. Now when we say красный we 99,9%...

Это был случай одного красен. - Sorry, this is nonsense. I can only guess that you meant something like "this chance/case is as good as any". Not even remotely close to being sure though.

Это был...