Quote Originally Posted by holmburgers View Post
Hey, thanks for everybody's input. Especially the holo links.

What factors go into successful developing, that is, how can you avoid shrinkage? (no jokes necessary.... )

Is it temperature dependent, agitation, chemical, etc.? Lemme guess, all of the above! I wonder what the success rate is.

So here's a question... if you used mercury, would the shrinkage problem be minimized? Why must one use mercury? I guess it's because the mirror has to actually be in contact with the emulsion? So just sandwiching a mirror wouldn't work I suppose.

For what it's worth, making emulsions is way out of my league at the moment; I'll stick with the limitations of the available plates.

Lastly, could someone explain this sentence.... "The Slavich [PFG-03c] emulsion requires pre-development hardening in a formaldehyde solution." Is this the fogging that R Shaffer was referring to??

BTW: Lippmann plates can be projected, which to me seems like one of the most practical ways to display. It requires an aphengescope type projector (basically an opaque projector as far as I can tell). Here is a book link that describes it.... http://books.google.com/books?id=pqk...escope&f=false
I'm certainly far from clear on the physics involved, but
Your recording in the film emulsion an interference pattern that occurs when light is reflected, the wave going out messes up the wave coming in. And if you have an emulsion with a fine enough grain, the interference pattern can be recorded. When you reverse the light reflection in the exposed & developed plate, it alters the light wave lengths to those you recorded and you see color . The paper you sent me has a much better description of what is happening.

The mercury acts as a mirror and so does the air-film with black space. Since the object, if you will, that we are recording is millionths of a millimeter, the gap between the mirror & emulsion would need to be incredibly small. The mercury mirror does move the location in the emulsion where the pattern is recorded further in. I don't know if this makes it easier to record or less sensitive to shrinkage & expansion.

The fogging I was referring to is due to the very small particle size in the emulsion. It can fog with-out light, but I don't know if it is a chemical fogging or something else. It can be cured.