>...I have been quite sucsesfull in "boosting" contrast with Pyro. That is:
>I have this quite obscure Croatian 4*5 inch film "EFKE PL100, on which it
>was impossible to produce densities bigger than say 1.2. Thanks to a great
>tip I learned that when I bleached these negs and re-developed in Pyro I
>got very nice negs for Cyanotype (sometimes the Dmax is even to high for
>Cyanotype!), Ziatype and Albumine. As stated before on this list: the
>stain means an added proportional density under UV.
In that a PYRO stain is not proportional to the silver densities, but is
least in areas of low density, and greatest in areas of high density, your
statement that the "stain means an added proportional density under UV" is
somewhat confusing. To what is the stain proportional?