The first printer I set up with this inkset was my Epson Workforce 1100. I doubt many will want to use this inkset in that printer (no QTR and not in production any more), but it makes a convenient test bed. It worked.
The 3880 toner ratios used for the 3880 Eboni Variable tone inkset (http://www.paulroark.com/BW-Info/3880-Eboni-Variable-Tone.pdf) worked perfectly for the glossy carbon. The only difference is that MIS amber base must be used for dilution as opposed to the generic base, which is not glossy paper compatible. The results that were important were, first, that the same 55% Canon Blue, 45% Canon Cyan ratio worked for the glossy carbon. The Lab A essentially stayed at the paper white level across the tonal scale. Second, the 75% amber base dilution was still sufficiently strong to achieve a neutral print tone all the way to 95% black. So, it looks like we have a universal light blue toner for carbon.
The carbon is MIS's Photo Black Carbon. This is a European sourced grind and proprietary to MIS, I believe. It's been in their inks and I've been using it for 5 years. It and the amber base are well tested products.
At least for testing, I'm staying with my usual 30% (LK) and 9% (LLK) dilutions, but with the components being separately available, it's very open and flexible.
I'll load my 1400 today with the mix and let you know how it works. With QTR and one position of Eboni MK in the printer I'll be able to better assess the inkset's potential.
Paul