Is this Cap a Tantalum??

[K1JOS]

I came upon a stash of MIAL brand axial blue molded caps with a black stripe around one end.  At first I thought these were vintage tantalums with the J being the old voltage reference for a tantalum but then I found many were of very low value, e.g, 0.0033 uF at 35v.  I don't see any modern tantalums less than 0.1 uF at Mouser or Digikey.  Attached is a picture of a typical one.  Any advice appreciated.

Jerry

[bills]

I am not sure but some caps have a stripe indicating the foil end (the lead connected to the foil) old school for rf.

[Paul Moir]

Dunno, but if you can sacrifice one, just hook it up to a current limited power supply.  If it's tantalum, it should leak like crazy well below it's working voltage if reversed biased.  10mA limit should be plenty.  I'd go 5, 10 then 15 if I didn't know the WV. 

Bonus if it's tantalum, you'll get to know if the stripe indicates the positive terminal or the negative... 

[Psi]

If it explodes under full voltage reverse polarity.. It was a tantalum