[pure-silver] word from ilford
- From: Eric Nelson <emanmb@xxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Tue, 14 Aug 2007 12:37:07 -0700 (PDT)
I got a call from Mike Bain from Ilford/Harman, and
his opinion, as well as one other person he consulted,
is that these prints we've been discussing have
suffered oxidative bronzing.
Now to me bronzing has been a defect that presents as
a reflective mirror effect with little or no
discoloration such as an over exposed albumen print,
but Mike assured me this is different and is
attributed to pollutants of one kind or another.
He's also seen this happen when soon after using a
cleaning solution on the glass it's put into the frame
and closed up. That cleaner which hasn't had enough
time to fully evaporate or outgas ends up affecting
the print in the same way.
His only suggestion to prevent this from happening is
selenium toning for a few minutes in either 1:19 or
1:31 dilutions.
I had always thought that silver prints processed &
washed well would be fairly archival and that selenium
gives and added amount of stability for the truly
paranoid and also cools the image, but it seems from
this conversation that selenium is pretty much a
necessary part of the silver process when sending off
work to unknown environments and handling.
Eric
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