After a similar experience I stopped using the inks described on Paul Roark's web site.
Compared to that approach, Piezography offers the following advantages:
Custom profiles available, linearized at 128 steps for your specific printer/paper combination
No clogging (pigment particles encapsulated in acrylic copolymer to eliminate electrostatic attraction)
A variety of ink color options like selenium, neutral, warm, cool
Tools for digital negatives for traditional wet and alternate processes
Everything works from end to end: you're not piecing together a collection of untested equipment
Superior ink, carts, syringes, packaging, instructional materials
Excellent customer support with fast turnaround time
Expert advice, web forums, blog, free instructional videos
On-site workshops for in-depth hands-on training
See http://www.kennethleegallery.com/html/tech/index.php#Piezo
Apparently they will soon be providing a new generation of 100% Carbon ink (their 3rd version) with a more neutral color (less red). I have not seen any sample images but am looking forward to the new ink.
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