Digital BW, The Print

David,
I'm not an expert at this but I think that something is getting missed here.. As far as print longetivity it all relative to many factors of exposure to various things so this is not an exact science by any means. People like Mark are doing their best to get their arms around it an dhelp us out.. I think we all realize now that fo rquite some time we have had a misunderstanding and have been mislead  to some degree. 
If the sole purpose is archivinbg for teh longest possible time then store a print inb archival packageing in dark controlled storage.. But many of us want to look at these prints as time passes.. Some of the coatings out there offer incredible UV protection that in itself is prioceless in some situations. 
So who is to take responsibility to test the individual coatings? Mark or someone like him? Come on!!  It may make sense to test coated versus uncoated prints but I could only imagine a lay person trying to lay a matrix of coating values over a layer of print values and trying to make sense of it.. 
Anyway we al lseem to be after that big long number that will have prints last forever ... The truth is theri ar emany short or mid term issues going on also.. I think many of us hav eseen print sshift in but a few years when displayed in certain environments.. In my very limited experience it seems the coatings help..


jimbo  ----- Original Message ----- 
  From: David Kachel 
  To: DigitalBlackandWhiteThePrint@yahoogroups.com 
  Sent: Wednesday, December 29, 2010 5:12 PM
  Subject: Re: [Digital BW] Gelatin's two-edged sword


    
  Mark,
  I am highly suspicious of products like this and am of the school that if
  any doubt at all exists, not adding something is safer than adding it.
  At kwalsh74¹s suggestion I went to Wilhelm¹s site and all I could find was
  paper/ink tests where PremierArt spray was used on prints being tested for
  ink longevity. If there were any tests of the spray in and of itself, I
  couldn¹t find them.
  It appears this particular spray does add projected years to the life of the
  prints on which it is tested. However, isn¹t what is really being tested
  under these circumstances just the longevity of the inks? Is anything known
  about the long term effect of this spray on papers?

  On 12/29/10 5:58 PM, "Mark" <mark@aardenburg-imaging.com> wrote:
  > 
  > Acrylic polymers like Premier Print Shield have a pretty good track record and
  > are widely used to protect paintings these days (especially paintings done
  > with acrylic paints). Research at both Wilhelm Imaging Research and
  > Aardenburg does suggest for the most part that acrylic coatings cut down on
  > photo-oxidation of pigments so improve lightfastness, gas fastness, etc.
  > However, the costs, the need for good ventilation during application, and
  > application challenges of spray or roller coating without defects means there
  > is no free lunch in the quest for durable, abrasion resistant coatings.
  > 
  > cheers,
  > Mark
  http://www.aardenburg-imaging.com

  David Kachel

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