Digital BW, The Print

Hmmm!
Might that be because acidic components in the coating are acting as
mordants to the inks and fixing them? It's interesting since it's my
understanding that the Epson inks (and compatibles) are somewhat basic.

Regards
Duane




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

> 
> 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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