He used C and M instead of PC and PM. I'm not sure what's wrong with GY, but perhaps the wrong ink has been used there as well?? There may be something funny about black too. I don't know what the solid bars are supposed to be.
I guess I don't know what you're trying to do. What kind of printer do you have or want to get? And what kind of ink and supply system do you want to use? ???
If you're trying to find Linux drivers for a Canon printer, my answer applies.
:celebrateAardenburg is back big-time, testing some of your favorite ink in your favorite printers. And they still need support to complete the work.
http://www.aardenburg-imaging.com/portfolio/inks-and-media-testing-2017/
http://www.aardenburg-imaging.com/ :weee
PeterBJ figured it out. I refill by a vacuum method called "Freedom filling". It requires more cleanup than many other methods, and you often get artwork like this as a side effect.
What, is this the first one of the new year? Here's my answer to that disputed Jackson Pollock. They want $100 million for that one, but I'll sell mine for only $50 million.
Disclaimer: my avatar is almost the same picture. But not quite.
I like to do accelerated tests--in direct sunlight or held against a fluorescent tube. With this kind of abuse, all the the third-party black dyes I have tested are among the most unstable inks I have tested. I just use OEM photo black.
On the other hand, all the text pigment inks I have...