Paint experts ? Chalky paint ?
It's been along time since I went to paint school, but it's very scientific and way over my head.
Anyways, here goes.
White would be opaque
The difference between transparent, translucent, and opaque objects is that opaque objects are denser in molecules than translucent objects and that translucent objects are denser than transparent objects.
Transparent objects let all the light rays pass through. (candy top colors)
Translucent objects are denser therefore allowing only some light rays to pass through because some are either being absorbed or reflected. (most base colors)
Opaque objects don't allow any light rays to pass through because all of the light rays are being reflected or absorbed. (i.e.,white)= duller finishes.
I think that's one of the things I learned in paint school, but like I said , It's been a long time.