You may help this link: http://www.photosensitive.ca/wp/meth...cing-bw-slides.
I have been testing the process reversible b&w on various types of films. Negative, positive and positive after the white / black. Many tests done on expired film for 10 to 20 years.
270 reversible black / white negative film photography made Azo (expired some eight years) in the process reversible b&w. http://www.dump.ro/imagini/270-rever...-azo-jpg/11107
336 Dup Positivfilm DP 3 is a picture make with Dup Positivfilm DP 3 (Orwo - expired about 20 years) worked in the process reversible b&w.
335 dup scris is a picture make with Dup Positivfilm DP 3 (Orwo fresh) processing in negative process b&w. http://www.dump.ro/imagini/335-dup-scris-jpg/10191
I am attracted to high-quality images. I did test positive film b&w. The reversible process we have not reached notable results with positive b&w. I like the pictures you've made with positive b&w (print). Negative b&w process. 319b N positive. http://www.dump.ro/imagini/319b-n-pozitiv-jpg/11104