Hi pdeex, I just checked ORWO Formulae book, edition 1986. It's mostly processing oriented book for all oRWO materials. It mention "Black and white paper for technical purposes" ORWO document paper, DP but there is no more specific info for processing. It's ORWO instruction 2361. For processing they recommend N120. It was "regular" ORWO positive developer. 111 is most likely surface and paper thickness designation. Did you process any unexposed paper, just to see it's Dmax? Good luck!