Digital BW, The Print

I think Ernst is correct that the better B&W performance is due to the
relatively high percentage of black & light black used.

Also, the non-use of the yellow ink is, no doubt, related to the
yellowness/warmth of the black particles.  However, I suspect the light
yellow UC pigment is used in the highlights, where I understand the light
black is not used.

However, I think the yellow is not the weakest color ink.  My reading and
fade testing suggests the magenta is the weak link, and it is still in the
UC "B&W" prints.  In my fade testing, the UC B&W test strip was starting to
show green shifting -- presumably as the magenta started to fade faster than
the other pigments.

Paul
http://www.PaulRoark.com