From: Lukas Werth (lukas.werth@rz.hu-berlin.de)
Date: 03/12/01-04:49:59 AM Z
At 21:04 11.03.01 -0800, you wrote:
>At 10:38 AM 03/12/2001 -0500, you wrote:
>>Joe Portale wrote:
>>
> Lots of previous stuff snipped.......
>>What concerns me more than anything else is the amount of contradictory
>>information one finds in the literature. One expert says develop for a
>>minimum period of time, another says you need to develop for 6-10 minutes.
>>One says clear for 2 minutes, another recommends 10-15 minutes. It would
>>really be useful for experts like yourself and Callie Type to clarify some
>>of the issues inherent in these contradictory recommendations.
>>
>>
>>Regards,
>>
>>Sandy King
>>
>>
> I wonder if anyone on this list has the wherewithall to do simple
>accelerated aging testing. The tests shold be similar to those for
>conventional printing paper since the image is silver.
> Generally this is done by baking the samples in an atmosphere of hydrogen
>peroxide in high humidity. I don't know the details but they should be
>available. I believe there is an ISO standard for this testing.
> It also occurs to me that the same sort of toner treatments which protect
>conventional silver images might work on Kallitypes. Has anyone tried
>something like Kodak Brown Toner to see if its an effective toner for
>Kallis?
>----
>Richard Knoppow
>Los Angeles,Ca.
>dickburk@ix.netcom.com
>
I would support this, and would be grateful for any information about
existing tests. All this "they were hanging for twenty years in the
verandah, and look as they did the first day" seems to me so much guesswork
and soothing of one's fears. I have had prints on RC paper on some walls
for more than 20 years; they still look the same for me, but unless I could
go back in time, and am not confident to recognize a subtle fading.
Are we not thinking in centuries? Of course some would state "the future is
another country"- one of the generally most stupidly used phrases I am
aware of.
Mike Ware notes that even Platinum prints may be affected by catalizing
substances in the athmosphere to produce, if I remember correctly,
sulphuric acid in situ which embrittles the paper base. Gold prints should
be safe from this, I might add. John Rudiak once made this point, I
remember. Carefully processed pigment prints also have the chance, for all
I know, to endure some centuries.
Prints made with silver, on the other hand, must at least be carefully
processed and toned to give them a chance for permanence.
If I come to think about it, the claim for permanence may be part of an
artistic statement, because it tells something about how an artist intends
to communicate.
Lukas
This archive was generated by hypermail 2b30 : 04/02/01-09:55:25 AM Z CST