Foils/Negatives for Cyanotype

Hello everyone,

i want to make big scale Cyanos. My problem is to make big Negatives. What do you recommend. Try to find a professional printing service? Has anyone tried it to make prints on transparent paper?
I started something with an old Dia-Projector ..... it won't work ... i will need a long exposure time ....
So, if anyone has ideas to make Cyanos with a size for maybe 1x2meters ..... let me know :-D

Greetings from the South of Germany
Florian

How about liquid emulsion on a transparent plastic material (like a big acetate) and project a positive slide onto it to create a negative?

I looked into that also quite a while ago. I know they make A3 transparencies for commercial needs but I guess that's too small for you. Eventually I opted out on it because I don't have the room or equipment to handle large sheets and anything larger seems to be non-existence. But I you find something then please let us know.

you might have to go the hybrid route, i did ..
but i did smaller negatives en route to larger ones...
blueprint shops may be able to help

I have a colleague at University of California, Davis Robin Hill. She does big cyanotypes. She prints negs on big sheets of acetate on an ink jet printer.

http://robinhill.ucdavis.edu/professional/cyanotype/cyanotype.html