I'm planning my first foray into an alternative process soon, and have chosen to try albumen prints using 5x4 negatives. From what I've read, it seems that the negs need to be pretty contrasty to avoid getting flat prints. My prior darkroom experience (many moons ago) was mostly geared around standard processing of the film, and then playing with contrast at the printing stage, although I sometimes pushed HP5. I'd appreciate some guidance on getting the contrast up in the negs.
In case it's a factor, I should mention that the intended exposure method is contact printing under glass, using one of those UV lamps that are used to check banknotes. I have a choice of two types of film: some Ilford Delta 100, and a full box of Adox CHS 25 ART has just been ordered. I'd rather use the Adox film, since there is more of it (50 sheets compared to 10 or so of the Delta), and because it's cheaper. The only developer I have is HC-110, which I would prefer to stick with. My B&W developing is irregular, and I chose the HC-110 partly because the syrup keeps well in the bottle. I mix directly from the syrup. I use a Combi-Plan tank.
My initial thought for increasing contrast is to rate the Adox 25 film at 100, and increase development time. If this is on the right track, is two stops okay, and what sort of time (and dilution) would suit?
Alternatively, is there anything I can do when making the paper that will lift the contrast there? It would be nice if I can aim for a fairly normal contrast on the negs, since I could then use them for other purposes without having to deal with high contrast.