JoeN:
And that bold stripe indicates the anode (+) on aluminum electrolytics in a metal can and cathode (-) on everything else. Go figure.
Wrong way round - stripe is for negative on Al, positive on tantalum.... Usually. But you read the manufacturer's datasheet anyway
so you didn't get it wrong 
It's not usual to say anode or cathode for a device that accepts current flow in either direction BTW, since its rather ambiguous!