You may also find this link useful. It is a research site of the George Eastman House, with lots of documentation, including historic stuff:


Especially this "Materials" page might be of some help:


And maybe the there linked summaries of the historic British Journal of Photography as compiled in a PDF:

Other possible useful links:
British photographic history - Information and discussion on all aspects of British photographic history
American Institute for Conservation of Historic and Artistic Works
Canadian Conservation Institute