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The metal can is the - terminal. The ones insulated with rubber are the positive ones, with color-coded terminals (for the older cap).
For the new cap, the - terminal is indicated by a --- strip if is radial, or if is a axial cap, the minus terminal is at the side with metal, and the + is where the rubber is located.
In the Internet various sites can explain about it better.
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So many projects, so little time...
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