bkyser wrote:
For the photos I used to take, I just purchased whatever standard weight paper I could get. Worked fine for me, but it's been years.
As a matter of fact, I can't imagine what is different about "special" pinhole paper, other than maybe they can charge more.
I could be wrong, it happened once.
Regular photo paper in a pinhole camera will yield a negative image, which could be contact printed if you want a positive. The OP was looking for reversal paper, so it is a positive out of the camera.