Digital BW, The Print

At 11:03 PM 9/6/01 -0000, you wrote:
>  Robert,
> Welcome back. Sounds like you escaped from the company intranet by 
> taking a trip!
> 
> Thanks for all the information in the e-mails, this post and the 
> three that follow.
> 
> There is one item regarding OBA's which concerns me and that is the 
> question of whether they simply stop fluorescing or if they break 
> down to produce chemicals that effect paper permanence.
> Martin
><> 
>> At 02:40 AM 9/6/01 -0000, you wrote:
>> {snip}
>> 
>>> Okay, Robert, what is the cold extraction pH of Museo? ;-)
>>> Also, as an aside, while the information you will find at this 
> link 
>>> clearly spells out what is needed for optimum paper permanence, 
> we 
>>> still don't know how these properties effect the image permanence 
>>> using different inks or media.
>>> 
>>> Martin Wesley

Martin, all:
The spec is 7.5 to 9.0 for an uncoated sheet.

Museo               cold extract:  8.2
                    hot extract:   8.3

Regarding, OBA's in the paper, it is my understanding that the UV rays end
up breaking down the OBA's so that they stop flourescing. i don't know
whether chemicals are produced in that process which would affect paper
permanence.  will ask and report back.
thanks
robert rex
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