Revealing “The Secrets of a Royal Portrait” | Dioptra / October 9, 2017 / ICACH More about read at Dioptra Revealing “The Secrets of a Royal Portrait” | Dioptra. Revealing “The Secrets of a Royal Portrait” | Dioptra by ICACH is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. Post navigation Previous Next Comments are closed.