Digital BW, The Print

Mark MacKenzie wrote:
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Clayton Jones" 
> <cj@...> wrote:
>>>> So of the two Hahnemuhle papers, the one with OBAs outlasts the  
>>>> "purer" paper.
>>>> Am I misunderstanding something?
>>> I don't think the OBAs is the significant difference between the
>>> papers.  I've had Harman FB Al in a south facing window since last
>>> summer and the paper base has moved from cool to neutral but doesn't
>>> seem to have other negative effects.
>> In addition, there are different types of OBAs.  We use the term
>> broadly, but when I did some research on the subject for an article
>> (#5 at the link below) it was pointed out to me that OBA technology is
>>
> 
> In general, if you are chasing permanence then stay away from using any 
> paper using OBA's.  They are not permanent, as they change so will the 
> presentation of your print.
> 
> OBA's are introduced into some papers at various stages.  Those that 
> are in the paper pulp tend not to move around much but will still fade 
> and degrade and change ? into other chemicals which may or may not 
> further degrade the image base.
> 
> Other OBA's are added in the ink receptor coating.  
> 

Henry Wilhelm recommends not to use paper with OBAs in view 
of the changing paper color in time.
On the other hand he says that he has no evidence that it 
will influence other aspects of permanency later on.
It's usually a dye as far as I know and I wonder what it 
could become to do harm to good fibers.

-- 
Met vriendelijke groeten, Ernst


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