Digital BW, The Print

Scott,

I use a test pen from Abbey Publications that uses chlorophenol red.  Since
they are such a strong advocate of buffering paper, I have simply trusted
their judgment as to the appropriateness of the pen's readings.

I should add, as Carl pointed out off list, that the coating of the paper is
acidic.  This is typical of the many of the best glossy papers -- the paper
inside is buffered, but the coating is acidic.  Epson Premium Glossy paper
has this pattern and is rated by Wilhelm at over 300 years in dark storage
-- right up there with UltraSmooth.

Paul
www.PaulRoark.com 






> -----Original Message-----
> From: DigitalBlackandWhiteThePrint@yahoogroups.com
> [mailto:DigitalBlackandWhiteThePrint@yahoogroups.com] On Behalf Of
> scott_now_coming
> Sent: Thursday, February 09, 2006 3:48 PM
> To: DigitalBlackandWhiteThePrint@yahoogroups.com
> Subject: Re: [Digital BW] Crane Silver Rag
> 
> Paul,
> 
> That Bromcresol Green pen only measures to about 5.6 on the pH scale.
> 
> Would a chemical such as Bromcresol purple be a better indicator
> since it measures to 6.8?
> 
> http://chemistry.about.com/library/weekly/aa112201a.htm?
> iam=momma_100_SKD&terms=%22bromcresol+green%22
> 
> I thought that in regard to "acid-free", we were looking for a pH of
> 7.0 +/- .5 .
> 
> I'm talking in general terms here, not neccessarily about Silver Rag
> here. I was going to post this question to you and logged on and saw
> this post.
> 
> Any thoughts?
> 
> Thanks,
> 
> Scott
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Paul Roark"
> <paul.roark@...> wrote:
> >
> >
> >
> > > ... Is it acid-free? Maybe buffered?
> >
> > Yes, the acid test pen indicates it's well buffered.
> >
> > > Does it contain optical brighteners?
> >
> > No, the UV light indicates there are no optical brighteners in it.
> >
> > Paul
> > www.PaulRoark.com
> >
> 
> 
> 
> 
> 
> 
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