Dan Burkholder has been doing pt/pd over pigment for a few years already. Although I have not seen the work mentioned here, I have seen many of Dan's prints and IMO you have to have a special "eye" to pull it off. Dan has a very particular style which compliments his printing very well. It is not only about greater blacks, but very subtle tonalities in color which enhance the color of a pt/pd print. Not to mention the fact that additional colors add (in some cases) interest to the print.
You might want to check Dan's web site and see more of this type of work.
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