> I would appreciate any help concerning options for large negatives
> (30x40 or larger) for cyanotype or other processes.
>
Micheal, Kodak's 4127 can (could) be purchased in rolls. It did however
require an investment of some $8000.00 US dollars. It is very similar to
4125 Pro Copy film. I haven't be involved in a purchase for several
years. Perhaps there is some out there, It was sold in sheets for
sometime.. Good luck
EJ Neilsen