Long time user of Piezography SE ink set, great split toning very little trial and error great prints they also had a Warm neutral to Selenium set which I tried for a while, also nice prints, but I preferred the SE - truth was that One could mix the ink set
any way you wanted as long as you kept the shades in the right positions. Better news is that the new piezo pro is about to launch - where the possibilities for split tone look to be infinite, and very accessible- pretty sure Walker will chime in on this
Berel Lutsky
Professor of Art
UW Manitowoc
920-683-4735