>I have many microfilm silver halide roles develop "J" spots
>and wipe out image when processed poorly. Apparently this was prevalent on
>film processed in 1960s. I guess I am just suggesting that one needs to QC
>microfilm masters and not assume they are going to last 500 years. One might
>have to "migrate" poorly processed microfilm at some point. I heard years ago
>that Canada had lost a significant portion of microfilmed vital records
>(births, etc.) from this problem.
my recollection is this was attributed to things like storing diazo film
and/or reactive paper (3-part carbonless carbons, etc.) or rubber bands in
the drawers with the silver halide film.
you're right though... and I'm sure that Bill will chime in here....
there's nothing like a well performed methyl blue test to ensure your film
was processed properly. And establishing standards for storage of archive
quality film goes a long way to increasing the life expectancy.
List archives at http://lists.ufl.edu/archives/recmgmt-l.html
Contact [log in to unmask] for assistance