Is it possible that ink settling can cause the color/tone of a specific ink to change? I am using Piezography2 with a warm neutral / selenium split tone ink set and having unexpected results on matte papers (mostly Hahnemuhle Photo Rag and Canson Edition Etching).
I decided to check linearization before printing & targets for custom curves, and found the results viewed in the linearization checker excel file have a reverse S-curve. Then after printing the QTR calibration target patches and viewing under my GTI 5000K lightbox, I perceive shade 2 to be cooler than the other warm neutral shades. I did remove and agitate the carts 2 weeks ago and did a power cleaning to remove a bad clog.
I suppose its possible that the ink slots are out of order but I was extremely careful when filling the cartridges. And the print results with glossy inks line up with the output from our other printer running the same ink combo. Would another round of agitation + power cleanings*potentially change*the hue of shade 2 ink to be warmer?
BTW These are the density measurements on Epson Enhanced Matte (measured at the 60% patch):
Shade 1 - MK: 1.6
Shade 2 - Cyan: 1.0
Shade 3 - Lt Cyan: .95
Shade 4 - Magenta: .75
Shade 5 - Lt Magenta: .49
Shade 6 - Light Black: .28