What role does the Glyoxal play? Is it to harden, or maintain the semipermeable gel state?
------------------------------------------------------------------
The Glyoxal hastens drying. It also improves adhesion to glass. It is not 100% required. An unhardened coating is functional. Actualy, Formalin works better for this. But my sinuses and eyeballs started protesting about Formalin.
----------------------------------------------------------------------

If you actually have a gel state... is it more like syrup than a gel?
---------------------------------------------------------------
The "gelatin substitute" is syrupy. It will not set-up. However, after adition of AgNO3 solution the look and "feel" of the emulsion is virtualy the same as a gelatin emulsion.
-------------------------------------------------------------------------


How long after prep. can you process the plates? (is there a known window, or does the surface remain permeable to water forever... will it dissolve away without the glyoxal?)
------------------------------------------------------------------
While I have not done a formal, deliberate study. The emulsion still "works" after days of sitting at room temperature. I have exposed and developed plates 3 days after coating.
------------------------------------------------------------------

I think I am familiar with the observation you made about sensitization of such emulsions...
it has been observed before.
---------------------------------------------------------------------
Thanks for the validization.
-----------------------------------------------------------------
Unfortunately, I know more about gelatin than any good vegetarian ought to....
I should be ashamed!
---------------------------------------------------------------------
I am ashamed (of myself). But I will not be mixing the "gelatin substitute"
with sugar,coloring and flavoring to be consumed by me or anyone else.

--------------------------------------------------------------------
You mentioned you hope "they" will manufacture it... is that part of the process difficult or time consuming?
-----------------------------------------------------------------------
The making of the "gelatin substitute" Is time consuming and labor intensive. But it is not "rocket science".
I don`t think many people would want to make it at home. ----------------------------------------------------------------

Looking forward to those pictures you promised![/QUOTE]
---------------------------------------------------------------
I had other mundane stuff to do. Hopefuly will coat tonight.
-------------------------------------------------------------
Bill