[pure-silver] Re: Restoring faded prints
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Thu, 27 Mar 2008 13:55:43 -0700
----- Original Message -----
From: "Nicholas O. Lindan" <nolindan@xxxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Thursday, March 27, 2008 2:44 PM
Subject: [pure-silver] Restoring faded prints
The idea that faded prints are not recoverable has always
annoyed me.
The silver is still the in paper. It may have combined
with
other less savory elements, but it is still there. The
image
has not gone away.
If one can't recover the image chemically then it should
be
possible by other means. There must be an absorbance band
in the UV or IR (or even in the visible) spectrum. I
would
think it is possible to scan it with a laser or photograph
it with a narrow band filter (narrow being 1 or 2
nanometers) and get the image data back. I am sure Raman
imaging could recover it but that is not (yet) practical.
A blue or green filter is traditional for photographing
stained prints for restoration as it recovers density
in the yellow-brown stained silver.
In today's digital post-modern age the original no longer
has cachet and an improved copy should be considered just
as good. Though 'improvement' is often anything
but.
==
Nicholas O. Lindan
Cleveland Engineering Design, LLC
Cleveland, Ohio 44121
There is a chemical method which was published in one of
the Kodak books but I am frustrated at not being able to
remember which at the moment. The method was not republished
because the images were found not to be permanent. However,
the method would be useful in bringing back stained or faded
images for long enough to scan them.
I will cudgel my brain about this because I never
actually forget anything but sometimes my disc access time
gets very long.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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