> ... I know the sepia toner I use not
> only gives it a nice warm tone but I think it is also used for
> archival purposes but I am not sure why.
> 
> If this would take too long if you could please direct me to a book
> that I could read about it in,  I would apprecitate it.
Klaus B. Hendriks: Fundamentals of Photographic 
Conservation, Toronto, 1991. pp.130-137 Toning for Permanence
 A short but useful description with recipes and additional sources, 
etc.
Bsslint Flesch
Flesch Bsslint
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