I decided to follow your document http://www.paulroark.com/BW-Info/Glossy-Carbon-Variable-Tone.pdf
I ordered an Epson 1500W (just arrived) and these inks: UTHEXPTPK + ESCBASEPTUC + UTTONER4LB (still on their way). I purchased Ilford Galerie Gold Fibre Silk.
How do you mix ink and base? (is the percentage by volume?) Do you inject both into the empty cartridge or use an intermediate container? Do you shake the mix?
I think I understood the basic of building an ink-only QTR profile.
I've got some flatbed scanner calibration targets (http://targets.coloraid.de/) which I could use to linearize the resulting curve.
However I don't understand how to include the toner in the QTR profile. Have you got some documentation on this?
If I compare your profiles
1. ArchesBW-back-Carbon.qidf
2. ArchesBW-back-Neutral.qidf
I see that the second has Y (toner) limit = 30 and a Y curve
Thanks,
Federico