I have tested HP-5+ processed in my Jobo CPP-2 with and without a prewet, and I am opting to exclude the prewet as I have noticed that prewetting reduces film s peed. First I developed HP-5+ at 8 1/2 min., 75 degrees in Microphen 1:1 with a prewet. I got a Zone I density (.09) at EI 500. I did the same, but excluded the prewet, and I got a Zone I density (.10 ) at EI 640. My Zone IX densities also increased, but not by much: 1.17 with prewet, 1.22 without prewet. I have read i n another post that Illford does not reccomend prewetting because it reduces fil m speed. My testing confirms this. Has anyone else run tests with and without a prewet?
Bookmarks