Polarity of "mylar" capacitor?

Tube DIY Asylum

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I recently purchased the 3nF/4kV capacitor shown in this eBay ad. It is said to be mylar and to have been made in Japan by Kyocera. Since it is supposed to be mylar and therefore nonpolarized, I wonder about the red band at one end of the capacitor body. I even tested one sample in both directions, using my Sencore capacitor tester, and it did work both ways, so I guess I shouldn't worry. If it's nonpolar, why the red line? Thanks.

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Topic - Polarity of "mylar" capacitor? - Lew 09:42:55 07/31/20 (8)

RE: Polarity of "mylar" capacitor? - coffee-phil 09:56:52 07/31/20 (7)

I think you're right. - Lew 10:16:06 07/31/20 (6)

RE: I think you're right. - coffee-phil 13:20:35 07/31/20 (5)

RE: I think you're right. - dave slagle 16:35:25 07/31/20 (4)

Thanks, guys! - Lew 08:24:59 08/6/20 (0)

RE: I think you're right. - Chip647 20:09:45 07/31/20 (2)

RE: I think you're right. - Tre' 23:08:19 07/31/20 (1)

I agree! - Chip647 13:13:04 08/1/20 (0)

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