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
> > >
> >
> >
> >
> >
> >
> >
> >
> > Please visit the Group Homepage to check the Files, and other
resources as
> > they are often being updated.
> >
> > http://groups.yahoo.com/group/DigitalBlackandWhiteThePrint
> >
> > If you wish to receive no emails or just a daily digest, or you
wish to
> > unsubscribe, please edit your Membership preferences by visiting
this same
> > page.
> >
> > Please follow these basic guidelines:
> > - As threads develop, trim off excess portions of earlier
messages to keep
> > them short.
> > - Good manners are required at all time. No personal attacks or
flames.
> > Hostile, aggressive or argumentative users may be removed from the
> > membership without notice.
> > - Keep your posts and threads related to the group topic of
digital B&W
> > printing. Users who persistently make off-topic posts may be
removed from
> > the membership.
> > - By posting on this forum you agree to abide by the group rules
and
> > guidelines, and to abide by the actions and decisions of the
group Owner
> > and Moderators. See "Group Topic, Rules and Guidelines" in the
Files
> > section:
> > http://groups.yahoo.com/group/DigitalBlackandWhiteThePrint/files/
> >
> > BY PARTICIPATING IN AND/OR POSTING MESSAGES TO THE DIGITAL BW,
THE PRINT
> > YAHOO! GROUP YOU EXPRESSLY UNDERSTAND AND AGREE THAT THE "OWNER"
AND
> > "MODERATORS" OF DIGITAL BW, THE PRINT YAHOO GROUP SHALL NOT BE
LIABLE TO
> > YOU FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL
OR
> > EXEMPLARY DAMAGES, INCLUDING BUT NOT LIMITED TO, DAMAGES FOR LOSS
OF
> > PROFITS, GOODWILL, USE, DATA OR OTHER INTANGIBLE LOSSES (EVEN IF
THE
> > "OWNER" AND "MODERATORS" OF DIGITAL BW, THE PRINT YAHOO GROUP
HAVE BEEN
> > ADVISED OF THE POSSIBILITY OF SUCH DAMAGES), RESULTING FROM: (i)
THE USE
> > OR THE INABILITY TO USE THE DIGITAL BW, THE PRINT YAHOO GROUP;
(ii)
> > UNAUTHORIZED ACCESS TO OR ALTERATION OF YOUR TRANSMISSIONS OR
DATA; (iii)
> > STATEMENTS OR CONDUCT OF ANY THIRD PARTY ON THE DIGITAL BW, THE
PRINT
> > YAHOO GROUP; OR (iv) ANY OTHER MATTER RELATING TO THE DIGITAL BW,
THE
Show quoted textHide quoted text
> > PRINT YAHOO GROUP.
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
>