[pure-silver] Re: b&w print has discolored
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Thu, 27 Mar 2008 00:44:43 -0700
----- Original Message -----
From: "Janet Cull" <jcull@xxxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Wednesday, March 26, 2008 8:09 PM
Subject: [pure-silver] b&w print has discolored
Tonight I picked up a print I had taken to a print
competition last year. It was matted with a bit of white
border showing. I re-matted it to show tomorrow night,
and upon close inspection I see that in places it looks
yellowish, orange-ish, and brownish. It almost looks
like a bad selenium toning job, except that I don't think
I'd have toned it because it's rc paper. The borders are
white with no stains.
I'm rewashing it now, but rubbing my hands over it doesn't
remove it so I don't think it's some surface gunk. It's
a good print. Well, it was!
Should I assume it was a problem with the fixer? I have
other prints I did at the same time and they look fine.
I don't know how it was stored, but by the condition of
the mat I know it wasn't handled as carefully as I'd have
liked. (I'll say, though, it's my fault for having left
it so long.) I took it in a large envelope and it was
returned without any protection at all - just handed to me
in the white mat, with a backing I had on it.
I've had prints go bad from exhausted fixer and from just
not having been left long enough. This looks different
from any of those I've seen. Maybe it's a new-to-me
fixing error.
There is a brownish tint along the edge of the image on 2
sides, but not on the white border. There are other
discolorations (slight) within the image, too. If it was
improperly fixed, wouldn't it be discolored overall - the
border too? I just walked back and put it in fixer, just
in case it might help. I don't know.
I don't suppose there's anything I can do at this point,
other than be more careful next time?
Thanks.
Janet
p.s. If this fixer doesn't change it (I can hope) I'll
scan it when it's dry and link to it so you can see the
stains, if that will help.
If the stains follow approximately the image its most
likely to be from incomplete fixing. Its very unlikely that
RC paper would be inadequately washed and lack of washing
tends to leave fixer in all parts of the emulsion resulting
in an overall stain although it may not be uniform. Since
fixer reaction products which are not soluble tend to be
concentrated in the image area they will result in image
staining. Much of the stain is probably silver sulfide which
is, of course, what sepia toned images are made of so they
look similar. The difference is that the sulfiding from
fixer complexes is uncontrolled and may also result in
bleaching of the image.
Its also possible that this is oxidation of the image
although that is more often seen as "bronzing" of the image
from extremely finely devided silver on the surface of the
print. Oxidation is a redox process where some of the image
silver is converted to silver oxide some of which can
migrate to the surface where it is converted to metallic
silver again by different polutants. Sometimes this
silvering out or bronzing can be removed by a mild silver
bleach as is used for dichroic fog but the image will have
been damaged.
Re-washing inadequately washed prints does no good after
a couple of weeks. The hypo and its reaction products will
gradually be converted to insoluble substances. About the
only thing to do is to reprint.
A suitable bleach for dichroic fog or surface silver can
be made by adding about 15 grams/liter to film strength acid
rapid fixer. Watch the film or paper very carefully because
this soluton can begin to bleach the image fairly quickly.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
=============================================================================================================
To unsubscribe from this list, go to www.freelists.org and logon to your
account (the same e-mail address and password you set-up when you subscribed,)
and unsubscribe from there.
Other related posts:
