I tried it with some crazy dilutions like 1:25 once with Forte Polywarmtone. Just seems that the further you dilute it, the more it shifts from black to a lighter brown tone. The one that I used at the really diluted end took like 10 minutes to develop is really soft in contrast, and really light brown. I didn't do any adjusting on exposure or print contrast when I ran these series though, I just figured a good exposure for 1:4, and then just kept making prints and adding water to the mix after every print to get a general idea how it effects the look at higher dilutions. Might be able to do some really pretty things with it if you actual put some effort into it. I didn't since the tones I was getting at 1:4 was what I was looking for.