Originally Posted by gainer
Last I heard, Tri-X was 400, TXP was 320, different curves as well as different speeds. Which are we looking for here? Both are (or were) available in sheet film.
Only 320TXP is currently available in sheet sizes.
If 400 was available in sheet film it's been awhile. My 1973 Kodak Film book doesn't list it.
That kind of settles the issue at hand, then. TXP is a long-toe upsweeping curve which, IIRC, was designed especially for portraits. HP5+ is much like TX in some developers, but in Rodinal it will not go much above CI = 0.6