I've not been playing with digi negatives for awhile, but I'm back and plan to explore gum over some more. I was doing 3 colour gums from an RGB separation, but I'd like to try a CYMK separation, with 3 layers of gum over pd/pt. As a start I'm doing a few 4 colour separations with lampblack for the K layer. I've posted the one I like the best so far. Maybe I'll like the 4 gum layers better than mixing the processes. I'll post as I go along and let you know.
Anyone ever tried this?

Sly, it's a nice print -> a little on the warm side but fits the subject matter perfectly. Congrats!

Anyone tried what? a) CMYK separations? b) K as Pt/pd and CMY as gum? My bet would be you're asking about (b); there are many CMYK printers out there -> Keith Gerling, Keith Taylor to name few...

As for (b), why not? Maybe with colder CMY paints for balancing the warm pt/pd K channel... I think you can get help from people printing pt/pd + inkjet hybrid color prints, about the specifics. Maybe Jim Collum (http://www.hybridphoto.com/gallery/browseimages.php?do=member&imageuser=42) can help?

Sly
I am very interested in this project, I plan to separate film using my Lambda exposing unit. I have got to the calibration stage and now am moving forward with four films rollie Iso 25 ortho off colour files.
All will be registered , the paper will be mounted to thin aluminum and registered punched.
I am very excited about this and plan to dedicate a year before I start showing prints.

I would love to see/hear your progress.

regards
Bob

I've not been playing with digi negatives for awhile, but I'm back and plan to explore gum over some more. I was doing 3 colour gums from an RGB separation, but I'd like to try a CYMK separation, with 3 layers of gum over pd/pt. As a start I'm doing a few 4 colour separations with lampblack for the K layer. I've posted the one I like the best so far. Maybe I'll like the 4 gum layers better than mixing the processes. I'll post as I go along and let you know.
Anyone ever tried this?

I was just thinking along these same lines as I have been playing with gum over pd toned kallitypes.

The experiment I was going to try was to make an underexposed kallitype of the complete image, no separations. Then print cyanotype, yellow & magenta over the top with RGB separations.

My tri-color gums always seem to need a forth layer to get the shadows and I've either done a forth layer of cyanotype or neutral tint.

Sounds like fun though.

Rob

PS: Your print looks great, love the warm highlights