Yes, the x-ray duplicating film is direct - When developed, the sheet of film produces a positive image. The film is very slow and requires very long exposures. I tray develop it in D-72 (pretty much Dektol). For consistency I use the developer as single-shot. This film can safely be handled under safelight.
The box I have doesn't have a brand name on it. If you Google "x-ray duplicating film" you will get several sources. I have not seen the film that Photo Warehouse sells but I expect it is similar. The film comes in a variety of sizes.
As I said in my previous post, I got mine from ebay. I really looked out - no one else bid on it so I got it for the opening bid of $2.50 for a 100 sheet box of 8x10.
Thank you Dan, I have all the missing pieces in place now.
Everytime I find a film or paper that I like, they discontinue it. - Paul Strand - Aperture monograph on Strand