How to determine what face is associated with a bit of text?

[skip at pobox.com]

I'm having trouble figuring out what face is used to render a particular bit
of text.  See the attached PNG.  I'm particularly interested in the
hard-to-read green text.  (This was clipped from an ipython comint buffer.)
Given a random bit of text is there some way to determine the face used to
render it?

Thanks,

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