love this stuff
from what i remember talbot's salt fixer sometimes wasn't permanent, sometimes it worked, and othertimes he had "troubles" ...
( that is why he was turned on to hypo ) ..
what i was told about the salt fixer is that it "preserves" the image, and sometimes it doesn't, or fix it completely. i wish i could remember who told me
and where i read it, i'd link to it for you.
i think its great to have materials to light-fast things
and develop things that are in a lot of kitchens ... the darkroomexpermente did all sorts of tests
and developed film in shallots, as well as rosemary and also what seemed to be dinner ( salad )
now with a little salt its fixed