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Like what everyone else said, no problem here. The black band on some older paper caps identifies the outside foil connections and some caps even say "outer foil" by the band. In some circuits, it may make a slight difference in performance if the cap is wired backwards; but, there won't be any chance of it blowing up or frying other components.
An electrolytic cap, usually found in values of 1 uf and above, are a different story. Unless you are dealing with a non-polarized electrolytic cap, you will need to observe correct polarity. Standard polarized electrolytic caps have some type of indication as to the negative lead (usually an arrow with a "-" sign inside the arrow). If you install an electrolytic cap backwards, it can violently explode, fry other parts, and/or cause severe performance issues. In vintage electronic work, the most common place to find non-ploarized electrolytic caps is in the speaker crossover network in stereo's, phonograph's, etc.
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