Piezo Pro Glossy Prints - Possible Thin Film Interference Coloration

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Piezo Pro glossy printing (Epson 3880) on Canson Baryta Photographique as well as Canson Platine Rag papers reveal slight color patterns. particularly evident in the midtowns, reminiscent of soap bubble coloration arising from the optical phenomenon of thin film interference. Particularly evident when viewing the print at an oblique angle. Has anyone else observed this effect?
—Tom Schleich