I've no specific suggestions for you, this purpose is really difficult to reach. As every good screenprinter you have to try and make your own experience. Anyway I can suggest to try using a transparent mat vinylic ink like Serimat and add some pearly powder. Varying the number of the thread of the frame and the thickness oth the emulsion is possible varying also the thickness of the pearly ink and the visibility against the light. But this is a kind os screenprinting research, so you have just to try.

This is Franco Ratto,