Some (but maybe not all) x-ray films are double-sided. A lot of pinhole photographers were using x-ray film in the 80s and 90s when Freestyle had it cheap. Being double sided, it probably isn't as sharp as "normal" films, but otherwise, works fine. Further, the stuff I used had rounded corners, and a blue cast to the base. One of these days I'll get back to my pinhole work with my stocks of x-ray and aerial roll films.

Quote Originally Posted by David A. Goldfarb
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Isn't X-ray film coated on both sides of the sheet?