Quote Originally Posted by ic-racer View Post
The Harman Positive Paper does both of those, so I'd recommend it.
We've used the Harman and the Efke positive papers. Both yield very high contrast results. With the right subject matter this can work, but for most subjects it doesn't work very well.

The answer is to pre-flash the paper. User JoeVanCleave on the f295 pinhole forum (http://www.f295.org/Pinholeforum/forum/Blah.pl?) discusses his experiences with Harman and pre-flashing at length.

You might find these two articles helpful, too:

Paper negative - the underestimated medium

(skip down to "Introduction")