Hi Jeff,
sorry, have been off the forums for a few days..
appreciate your concern regarding longetivity of K7 selenium and other non-pure-carbon inkets..this issue has been dealt with before and there is a lot of info out there..
Please see this link:
http://www.largeformatphotography.info/forum/showthread.php?84883-Permanence-of-non-carbon-sepia-Piezography&highlight=coneAardenburg imaging further describes his criteria (which are great and very strict) where he states that all Piezo K7 inks, under "normal" collector display conditions, should last for 100+ years without "noticeable" shift...Carbon is the best at 140 ML hours but the real issue for me is how many ML hours do you really need? I would only hope that my work is worthy to be viewed by someone for that long besides someone in my family! I prefer the tonality of K7 selenium printed on Canson Platine (non-OBA) and Canson Baryta (some OBA) so I print.
The real story here is that Mark at Aardenburg does great work; however, a close reading of his findings is needed to understand how they relate to your printmaking needs.
To further aid your B&W exploration, there was an excellent article written by Jon posted on the agnostic print:
http://theagnosticprint.org/the-state-of-the-state-of-the-arts-in-black-white/You will find several print makers referenced here who can make some prints for you so that you can truly see and compare before you decide.
Going back to another question regarding Imageprint and color print quality from a different poster... I agree with Stefan. Even with contemporary Lightroom, Epson 4900, OSX, I1Profiler profiles, I find the image quality better with Imageprint. That is why I purchased it. For me, the real difference was in the quarter tones..I especially noticed this with portraits that had higher contrast ranges when I was striving for "translucent" shadow luminance and skin "touchability"..sorry for the cheesy words, I am trying to express what I saw - I would not part with my $$ if I didn't see a meaning (to me) difference.
Also in agreement with Stefan, I was tired of subtle changes that happened in Apple/Adobe/Epson color management as these vendors evolved their software and systems over the last X years. I lost a fair amount of time and effort figuring out how Photoshop's latest color management behavior changed on Apple's latest version of OSX. Imageprint took that variable away.
Anyway, hope this helps in your search...
Regards,
George