Ok, the fact that you view the color from the emulsion side is probably the most important fact here. Indeed, Friedman is completely wrong in this case.
I'm very interested in what you physicists and "hologramistes" can do for a modern day reflector. Martin, you mentioned aluminized PET and methods to destroy the reflector, and then Yve's Gentet is supposedly working on such a means as well.
Here's a theoretical proposition... is there another liquid that would be easier to work with than mercury and more reflective than no mirror whatsoever? For instance, would there be an advantage in using water as opposed to no reflector at all. In the reflector-less, Bjelkhagen method (we'll call it), the reflection comes from the emulsion-air interface, correct?
I'm just wondering if there's another option that hasn't been tried yet, but I admit to asking this in total ignorance of the necessary conditions.
Struan, as for Midsummer... har de bra!