I'm using the WF-2010W setup cartridges to print profile target sheets and to get the black levels with different settings. The driver has a paper selection of Ultra Glossy with a standard quality setting, this mode mixes the black from the colors. I'm using mostly the Aldi/Netbit PE photo paper and a LS180 cheap cast coated photo paper. The Durabrite inks show a pretty strong bronzing and gloss changes - the look is not very pleasant on the Netbit paper, and pretty bad on the LS180 paper. I overprinted the prints with a gloss optimizer on a R800, this improves the look somewhat but still does not give a very pleasant look. I printed as well with the matte standard setting which uses the black ink, the ink saturation is less, the printouts are lighter overall all with the ICM off option setting. These prints got as well a GO overprint.
The black level on the Netbit
with the ultraglossy setting gives a Lab = 13.00 2.05 -.26
the GO let the black level drop slightly to Lab 11.98 -5.79 0,12
the black level on the Netbit
with the matte setting and GO gives a Lab 13.78 -.5 -1.17
this with the genuine Epson black ink which is sensitive to the touch without the GO overprint on
glossy surfaces. The color tone of the black ink is pretty neutral, the L lightness level is just slightly higher than the composite black which shows a blueish cast .
The black levels look somewhat different on a matte Epson paper, printed with the same driver settings.
matte Epson paper with ultraglossy standard driver setting - composite black - Lab 27.10 0.26 -7.09
that is not a very good black level for photo prints, pretty light and with a cyan color cast
matte Epson paper with matte standard driver setting - genuine black ink - Lab 19.97 .65 1.34
that is a visible improvement of the black - a darker black, and almost neutral.
This overall confirms the findings above - the Durabrite inks are not very well suited for good photo prints on glossy papers, using another photo black is a compromise but would not improve
the look of the Durabrite inks on glossy surfaces.
And another effect turned up with the GO, it removes the bronzing but adds strange looking small stains - my GO does not harmonize with the Durabrite inks at all - it does not work together.
I have some refill cartridges on order to do some more tests with the inks I'm using in the R800 at this time, and other dye inks.