In my tests, ConeColor Pro PK is glossier and darker on gloss and semi-gloss papers than CCP MK. I tested several different black inks on both rag and glossy papers, evaluating the gloss results with and without Gloss Overprint. All inks were tested individually by printing the Ink Separation image thru QTR Calibration Mode (not by printing regular images and changing the black, which would also use other inks in combination with black). I Used our Type 5 paper for the gloss tests, and Hahnemuhle Photo Rag for the rag tests.
The results show that ConeColor Pro PK measures about 1.638 on HPR compared to 1.674 with CCP MK (both are visually very dark). On gloss paper [U]without[/U] GO, PK measures about 2.107 (and is visually very glossy), compared to 2.082 with MK (visually glossy, but not as much as PK). [U]With[/U] GO, PK measures about 2.371 (visually very glossy), compared to 2.269 with MK (visually slightly glossy). Piezography Warm-Neutral (AKA “Opaque Black”) measured about 1.583 on Photo Rag (is visually not as dark as CCP MK or PK), 2.341 on Type 5 paper [U]with[/U] GO (visually very glossy), and 2.034 [U]without[/U] GO (also visually very glossy). Although this test is only evaluating the black inks on their own, and not in “real world” printing applications with other inks, and certainly the other inks can effect the black, I would suggest using ConeColor Pro PK if you wish to use one black on both matte and gloss papers. [/QUOTE]
Looking at these numbers again, the one that’s missing is matte shade 1 on HPR. Do you have a comparable number for this combination to complete the set?
By way of comparison, I checked the values produced by my R1900 using Opaque Black on HPR, and the values for black that I measure from the 21x4 calibration print were 1.451, 1.649, 1.641, 1.633, which are mostly higher than what you measured.
[I know that this is a thread about colour inks, and so a strange place to be asking about piezo shade 1 on matte, but it’s the only place that I’ve found where all these numbers come together in one spot.)
Edit: I realised that the 21X4 chart is not just the opaque back - since we’re not in calibration mode it also includes other shades, hence the higher dmax I guess. If I want to measure dMax of just that ink on my system I’ll need to print 100% black in calibration more. But my question about whether you have a comparison still stands.