Digital BW, The Print

Thanks Paul. I was assuming (!) you were using the Light 
Impression "green" pen.

That's interesting about the coating being acidic.

Thanks,

Scott

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Paul Roark" 
<paul.roark@...> wrote:
>
> 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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