Digital BW, The Print

>...
> why is it that EEM, with OBAs, turns yellow, but that you suggest that
> this paper, also with OBAs, is more archival?

I detect yellowing in all papers with brighteners that I've tested.  The
OBAs may differ in quality, but all of those used in the papers I've dealt
with "fade" like any dye.  When that happens, the paper becomes more like
the natural, non-OBA papers in that there is a slight creamy look -- which
is yellow in comparison.

The fading of the OBAs does not necessarily affect the image or longevity of
the paper.

EEM's "problem" (from a long term storage perspective) is that it is acidic.
Acids attack the cellulose of the paper (even if they may actually help the
image).  So, acidic paper is not considered "archival," which usually refers
to dark storage life.

While the yellowing I see in fade testing with EEM and other brightened
papers appears to be from light exposure fading the OBAs, the yellowing that
happens from acids occurs even in dark storage.

Whether the acid reserve in EEM is primarily lignin is questionable.  One
initial test by an expert on another list found little evidence of lignin.
My informal and not particularly long UV test of EEM with others found
little difference -- all the good papers and EEM actually were bleached by
the UV (back paper side, not OBA-laced coating).  Lignin is photo-sensitive
to UV and should have caused a yellow shift if it were present in
significant quantities (some cheap but buffered papers yellowed from their
lignin content).  But EEM is clearly acidic, and an Epson tech has told me
it is not lignin free.  While it makes an excellent display medium, it is
clearly not collectible -- not to be used where long life is desired.

Paul
www.PaulRoark.com 





> 	I realize that I am using "archival" incorrectly - EEM doesn't
> actually
> fade, right?  It just turns yellow.  Therefore, is the yellowing a
> result of solely the OBAs, or because of some other characteristic of
> EEM in particular?  If it's from the OBAs, does that mean that all
> papers with OBAs will yellow, either at all or as much as EEM?
> 
> thanks,
> allan
> 
> Eric Ashworth wrote:
> > This paper might fit the bill. Go to,
> >
> > http://www.photowarehouse.biz/premier.html
> >
> > scroll down to Premier Premium Matte (bottom of the page). The paper
> > is acid-free and does contain OBAs, so it is quite bright. And, a 44"
> > roll is $109.95. It is meant to be used generally as proofing paper,
> > but you might find it works for you. You can also get a pack of 50
> > 8.5x11 sheets for $12.95, if you wanted to try it out first.
> >
> > Regards,
> >
> > Eric
> > www.ericashworth.net
> >
> > [Non-text portions of this message have been removed]
> >
> >
> >
> >
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> 
> Please visit the Group Homepage to check the Files, and other resources as
> they are often being updated.
> 
> http://groups.yahoo.com/group/DigitalBlackandWhiteThePrint
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> unsubscribe, please edit your Membership preferences by visiting this same
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> 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
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> 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
> PRINT YAHOO GROUP.
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