Two main themes at the moment. First is a (maybe) novel method for forming emulsion, which would allow daylight coating (if it works). Basically, I would mix colloidal silver into gelatine, and then coat the support (glass or flexible) with the gelatine/colloidal silver emulsion. (At this point, the emulsion would be black, entirely DMax across the surface.)

Then, I'd go "lights out" (or, put it in a tank), and soak it in a halogenating bleach (i.e., potassium bromide and potassium ferricyanide, to make a silver bromide emulsion), and then, rinse, and dry.

In theory (my theory, at least), I'd then have a silver bromide emulsion (non-color sensitized).

You think this'd work?


Actually, it has been done to make Lippmann emulsions. There's a 1929 French paper (http://www.holographyforum.org/lippm...es_a_grain.pdf) describing such a method (by the way, there are a great many papers dealing with the making of Lippmann emulsions available at:
http://www.holographyforum.org/HoloW...ppmann_Papers).
Ferricyanide doesn't seem to be a good solution for the bleach though. Leroy used a diluted copper sulfate bleach. Ultimately, the emulsion was spectrally sensitized.


A third possibility, which I think I recall having read that G. Eastman patented as his first "simple" method for coating plates, would be to use what I'd call a sort of "offset" system: A roller (rather large) sitting in a tray of liquid emulsion, which rotates, picking up a coating of emulsion, which is then transferred to a sheet of glass that passes horizontally along the top of the roller. (The roller would be "wet" with emulsion just prior to contacting the plate, and then "dry" (emulsion layer completely transferred) on the side that had passed the plate.)

Mayer bars might be another option...

H