>I have read suggestions that the gelatin on the *final* transfer sheet, after
>development and cold wash, could be hardened in alum (standard silver/gelatin
>hardener) for greater protection, or if another layer was to be transfered, say
>for tricolor printing.
I may have been the one who suggested the latter part of this sentence in
some of my earlier articles or books. As it turned out, this caused
conservation problems: in some cases the layers would become separated
after a while. The extra hardening prevented a good adhesion.
>On the tissue it would immediately kill it.
Indeed it would.
Luis Nadeau
nadeaul@nbnet.nb.ca
Fredericton, New Brunswick, Canada
http://www.mi.net/dialin/awef6t/