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Here's an easy way to 'find' the foil lead.
Take the cap in question and hook it across a guitar cord plug, connected to an amp that's running.
Pinch the cap body between your thumb and forefinger. Swap the polarity of the cap and do the same test. In one orientation, you will hear more induced hum than the other. The orientation that cause the most hum will have the outside foil lead connected to the plug tip.
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