LensWork-style black and white tone for darktable

Has anyone here tried to replicate the classic LensWork duotone look in darktable? I found some details online, but not enough to figure out where to start.

LensWork is printed in full color and duotone, which has deeper blacks, richer tonality, and can reproduce warm hues that more closely match warm-tone original prints

The Lenswork printing is duotone using Pantone Warm Gray 11 and process balck.

Thanks everyone, and happy new year!

Can you supply a sample image? I am unsure what you are looking to do to your images. I remember warm tone printing paper and that would just be a monochrome image with a slightly warm tone rather than neutral greys.

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Thanks for the response. Here are a couple of examples:

Seems like you can use Color Balance RGB’s 4 way tab to add just a little red to the shadows and midtones.

For my black and whites, I add an extra “color calibration” module using the builtin preset monochrome > luminance-based and move the module after (above) the tone mapper (I use AgX).

I then turn on the “split-toning” module (see manual for basic information: darktable user manual - split-toning). For both the shadow and highlight color I set them to the Pantone Warm Gray 11 C (hexidecimal value#6F625A - see: PMS Warm Grey 11 C (Coated) | PMScolorguide.com)

I use the following settings:

You may need to adjust the saturation, balance or compress sliders to get the exact look you want.

Save it as a preset.

Hopefully something like that helps. Good luck!