Digital BW, The Print

I do as Julian does. Unfortunately I don't see independent tests for the
carbon quads, but I take these factors into account and do the best I can
with making something meaningful from them:

Enhanced Generations on Hahnemuhle paper is at 100 Wilhelm years and
counting, and they use a less stable black than the Piezo or MIS VM black.

100 W. years is longer than most color photographs are rated by W.

I base my claim on using carbon pigments on H. papers.

Color pigments are likely to be less stable than black carbon pigments, thus
carbon quads are likely to last longer than color pigs, which already test
longer than most color photographic materials (Perhaps dye transfer lasts
longer).

I know (know? well no I don't know) these prints won't last as long as
silver BW prints because I'm told conditions which fade these guys
appreciably don't budge silver prints.

So all told I feel Julian is about right in a ball park sense. At least it
shows it's in there among other collected mediums...

Todd

>> I'm uneasy with Julian's answer, partly because I don't think we
>> should say anything on our own authority because I don't think we
>> know. I think we should point people to credible independent testers
>> such as RIT and Wilhelm. If we do, won't they find color prints with
>> longer lifespans than BW? My guess is that's only because some ink
>> manufacturers have been investing in the testing longer than others
>> or have been testing color but not quadtones. I think it would take a
>> fairly long and elaborate answer to include such interpretive notes,
>> and an even longer and more elaborate one to say anything very
>> encouraging about ink-and-paper combinations not tested by any third
>> party. That would be good to do, I think, and might result in
>> something useful as a handout or enclosure, but I'm afraid it's a
>> major project.
>> 
>> Sam
>> 
>> 
>>> Whenever I'm asked I always say better than colour and not as good as
>>> selenium toned silver.
>>> 
>>> Julian
>>> ----- Original Message -----
>>> From: "frankg_photo" <frank@...>
>>> To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
>>> Sent: Wednesday, December 19, 2001 2:24 PM
>>> Subject: [Digital BW] print sales - longevity claims?
>>> 
>>> 
>>>> when you sell your "carbon pigment" prints (MIS or Piez), what claims
>>>> can you safely make regarding the archival issue.
>>>> 
>>>> How long can you safely claim the print's integrity under 'normal"
>>>> hanging conditions in a home environment (which I'd say is a fair mix
>>>> of ambient(uv) & artificial (mostly tungsten) light.
>>>> 
>>>> Dark storage, pollutant free, humidity controlled environments are,
>>>> of course, a little different.
>>>> 
>>>> I realise this would be specific depending on which paper has been
>>>> used; but I'm just looking for some guidance- or a ballpark range.
>>>> 
>>>> thanks
>>>> frank
>> 
>> 
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