Tim,
My understanding is that the Septone inks (old Piezography inks) are quite different than the Piezotones, which is a new generation of inks. The Old Piezography inks faded and warm shifted quite noticably, while the current generation inks (Piezotones) do not.
As far a fading and tonal shifting goes, it seems that the current generation of MIS (using the Eboni black) and Piezotones are about equal. Either can outlast the paper they are printed on.
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