[pure-silver] Re: Wrinkles
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Mon, 8 Feb 2010 16:09:16 -0800
----- Original Message -----
From: "Myron Gochnauer" <goch@xxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Monday, February 08, 2010 3:32 PM
Subject: [pure-silver] Re: Wrinkles
The other option is to leave them in the wash tank/tray
overnight but that may or may not be detrimental to the
paper and may or may not wash out the optical brighteners.
You can test the effect on optical brighteners by using a UV
"black light". I have never had an overnight soak affect
the optical brighteners. I'm pretty certain the brighteners
will not wash out uniformly. ...after forgetting about a
print in the washer for three days, the brightener pattern
was ugly-blotchy.
Myron
Not all papers have optical brighteners, they are used
in pure white stock but not in tinted stock. However, there
are other reasons to avoid long soaks. They tend to damage
both the paper fibers and the substrate. At one time such
soaks were suggested by some reasonably authoritative
writers for achieving archival hypo levels. They were wrong
on two counts: one is that such soaks are relatively
ineffective for washing and; two, they damage the paper.
Washing of double weight paper even without the use of a
wash aid is essentially complete in about two hours in
running water. The use of a wash aid cuts this by half or
more.
If paper tends to curl or is not badly cockled it can be
made to lie flat by drying it in a dry mounting press. The
emulsion side is protected by release paper and the support
side is in contact with heavy "kraft" paper or blotter
material. The sandwich is placed in the press and the press
closed but not locked. About two minutes is enough at a low
press temperature. The result is that the support side is
dried out while some moisture is retained in the emulsion
side. Fiber paper flattened this way will stay flat. This
procedure is part of the proper method of dry mounting but
can be used for any print.
I have run into paper which developed edge frilling
after processing. This was mostly AGFA paper. There is no
cure for it, the prints have to be made with borders and the
frilled edge trimmed off. It has something to do with the
manufacture of the paper and seems to be unavoidable. I
don't remember ever having this problem with either Kodak or
Ilford papers.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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