Mark, a pleasure to have your input here; nobody's better suited
to highlight the finer points of collodion than you!  Well then,
how do they work? I always got the impression that if your wet-
plate dried, you were up a creek. So what's different about
collodion-emulsions? It seems that the silver-salt being inside
the collodion would make these even worse, but obviously I'm
missing something..  Isn't it also true that collodion emulsions
were used up until fairly recently for certain uses? I've seen a
mordern, yellow Kodak box labeled 'Collodion' that appeared to
be from the 60s/70s. Maybe for certain industrial process,
photo-reproduction, or copy work?  Sincere thanks,