This thread has been a real lifesaver for me. My Canon iP4600's black pigment nozzles are clogged, and I was ready to buy a new printer. But I found this thread and tried printing text on regular paper by telling the printer I was using matte photo paper... and it worked great. The blacl looks almost as black as with pigment - all but indistinguishable. Much slower, of course. But at least I can get some more use of out of the printer (the colors still print fine).
Now if anybody has a suggestion as to how I can unclog those black pigment nozzles, that would be great. The middle third are clogged. I tried washing out the entire print head with warm water, then soaking it in alcohol for several hours and blowing air through it, but it's still clogged.
Anyway, thanks for helping me bring my printer back from an early grave. Hat's off!