Digital BW, The Print

David, in my experience that usually a mottle from too much ink, actually tiny beads, or puddles. More limiting is the only answer, and if it's in middle tones, that means more limiting of the light inks. If you are using the OEM RGB driver, your only way to control that is with media settings. GO all the way down to the plain paper setting, if all is well there try moving to higher inking settings and see if there's a compromise. Then of course you'll have to reprofile.
If you are using qtr, limiting each ink is a bit easier to do. Also, evaluate dry, it tends to calm down a but from when it first comes out wet. I use Ergosoft for this work, so can't verify the above will get you there, but it's worth a try.
Tyler

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "davidkachel" <david@...> wrote:
>
> Hoping someone has a solution to this problem...
> I have switched to watercolor papers completely (Arches, etc.).
> Though I am very pleased with the results I am getting, I am occasionally experiencing a problem I did not have with standard coated papers. (Anyone want to buy some Red River Aurora Natural? Unopened boxes?)
> A few images show a grainy/noisy appearance in some of the midtones that never showed up on coated papers.
> This is happening with papers for which I am using custom profiles I have made. When it does happen, it seems to happen on whatever paper/profile combination I try for that image.
> If you have seen anything like this before, please tell me what you believe caused it and what you did to solve the problem.
> Thanks.
>