Hi !
I would very much like, if you had done some tests,
to see photos of prints made on printing beds having a diffraction grating / refraction pattern.
Like "PEY", "H1H", "H5H" Juupine or "P-Flat", plate, which allows the printed surface in contact with this type of plate to have some rainbow reflections pattern.
Here for example, a print made on a “PEY Circle” tray with a glossy black PLA filament. Where we can notice the rainbow reflections of a pattern of small circles, reflections which change depending on the orientation of the light and the angle of view.
And an other tests on a "H1H" plate, which has a different refraction pattern depending on the face used.
Here is empty