Digital BW, The Print

I just spent a couple of hours reading through patents, and I found some
interesting stuff.

I won't go into any specifics about their formulas, but in general:

Epson is well aware of issues such as clogging, settling, fade and
colorshift, and they appear to be spending a great deal of effort in
engineering their inks to solve them.

Among other tests, they've conducted accelerated fade testing using a 100
kilolux xenon lamp with long and short UV capabilities and a
spectrophotometer over 200 to 600 hours.  They also mentioned testing for
discoloration resistance for 3 hours at 40C in an ozone concentration of 200
ppm.

Carbon black yellows over time.  Epson has addressed this.

There is a lot of crap in these inks.  Reading the patents reminds me of the
feeling you get when you visit a hotdog factory.