I'd just say that they're inkjet prints that use pigment-based inks; the first part is the simplest statement of what they are, while the second is a reasonable qualification because it establishes that they're likely to have decent longevity.
I'd skip the apologetics about how you used to be a silver printer. You're entitled to use whatever medium you want; the fact that to your taste this one best achieves your current esthetic objectives is justification enough.
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