This should be obvious, but isn’t. The black bar marks the negative terminal and the corner-cut side of the base marks the positive terminal.
How much would it cost to put little hyphens down the middle of the black bar?
The data sheet for a related, not identical, series of caps is there.
The Smell of Molten Projects in the Morning 
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3 responses to “Nichicon SMD Electrolytic Capacitor Polarity”
Anyone who has done any circuit prototyping over 20 years would agree, I think.
I guess the “young ones” would think it’s normal.
In these days of cost cutting, and save micro-cent mentality… a big hyphen in the middle of the black bar would be spot on, less ink, less money, more green, and every fifth print would be free at current costs *20% savings right there ya know… never mind consideration of the cutomer.
A friend ran across an electrolytic cap with big hyphen-like symbols inside a bar along one side, aligned with the terminal, but having NP printed inside the hyphens. Turns out that’s the designation for a Non-Polarized capacitor.
Ya learn something new every day…