Digital BW, The Print

I was just looking over some of my prints done on Entrada Natural and 
notice that the paper seems to be yellowing. I also noticed some 
uneven yellowing in at least one print. Has anyone else encountered 
this? Very disturbing to say the least

John H

fyi..Ive email moab on this, and another issue Ive heard...
apparently (and cannot verify) but the yellow inks supposedly fade 
much more rapidly than do the other inks (which dont fade much at all)
leaving a potential bluish cast eventually..
This all takes me much be surprise, Im hoping this may well be an 
old paper stock issue that has since been rectified.
how old was the stock you printed on and when did you print the images
you mention below?
Frank


--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Mr_Misty_44"
<jharvey@...> wrote:

>
> I was just looking over some of my prints done on Entrada Natural and 
> notice that the paper seems to be yellowing. I also noticed some 
> uneven yellowing in at least one print. Has anyone else encountered 
> this? Very disturbing to say the least
> 
> John H
>

pekozip93 wrote:

> fyi..Ive email moab on this, and another issue Ive heard...
> apparently (and cannot verify) but the yellow inks supposedly fade
> much more rapidly than do the other inks (which dont fade much at all)
> leaving a potential bluish cast eventually..
> This all takes me much be surprise

It shouldn't. There are a number of issues with using color inks to 
print B&W images. One of these issues is differential fading causing 
color shifts as some colors fade faster then others. Search the archives 
and you'll find discussions of this and numerous other topics about 
using color inks to print B&W images.

While the current crop of inks is pretty good about this, it's not 
immune. Most prints framed under a glazing will do OK. If your prints 
are just laying around without protection, then can pick up 
contamination from air and surfaces they touch which will vastly hasten 
their deterioration. Laying a print on top of a newspaper overnight can 
cause it to yellow within days for example. Storing unprotected prints 
in a wooden drawer can have a similar effect. I have no idea what this 
would do to the inks, but it can't be good.
--
Bruce Watson

Ink fading is not a paper issue, unless a particular papers cause inks to 
fade differently than other papers of that type in class, which is not true of 
Entrada. Differential ink fading is a fact if life, but yellowing indicates Cyan 
ink fading, not anything happening with the yellow ink. I see no note of what 
inks you are using, but this is most common with dye inks.

C. David Tobie
Product Technology Manager
ColorVision Business Unit
Datacolor Inc.
CDTobie@...
www.colorvision.com




In a message dated 4/11/06 10:50:11 AM, photographer93@... writes:


> fyi..Ive email moab on this, and another issue Ive heard...
> apparently (and cannot verify) but the yellow inks supposedly fade
> much more rapidly than do the other inks (which dont fade much at all)
> leaving a potential bluish cast eventually..
> This all takes me much be surprise, Im hoping this may well be an
> old paper stock issue that has since been rectified.
> how old was the stock you printed on and when did you print the images
> you mention below?
> Frank
> 
> 
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Mr_Misty_44"
> <jharvey@...> wrote:
> >
> > I was just looking over some of my prints done on Entrada Natural and
> > notice that the paper seems to be yellowing. I also noticed some
> > uneven yellowing in at least one print. Has anyone else encountered
> > this? Very disturbing to say the least
> 



[Non-text portions of this message have been removed]

CDTobie@... wrote:

> Ink fading is not a paper issue, unless a particular papers cause inks 
> to fade differently than other papers of that type in class, which is 
> not true of Entrada. Differential ink fading is a fact if life, but 
> yellowing indicates Cyan ink fading, not anything happening with the 
> yellow ink. I see no note of what inks you are using, but this is most 
> common with dye inks.
>
> C. David Tobie

I respectfully disagree. Ink and substrate/coating form a system, all 
parts effecting to a greater or lesser degree the other parts. The 
coating on a paper can have an effect on ink longevity. Particularly the 
porosity of the coating. This is particularly true of dye inks, but 
should also be true of pigments inks if to a lesser degree. The theory 
is that the coating can protect the ink from atmospheric pollution. The 
type of binder used in the coating can also effect ink longevity, as 
does the effective use of a mordant, again more for dyes than for 
pigments, but something one can not discount out of hand. I'm sure there 
are other factors as well, but I haven't seen any papers discussing 
them. Not that I'm spending a lot of time looking.
--
Bruce Watson

In a message dated 4/12/06 9:06:10 PM, hogarth@... writes:


> 
> I respectfully disagree.
> 

The question was on a far more basic level: the user was assuming color shift 
was being caused by the paper changing tone, when its almost surely the inks 
changing tone. Yes, the paper and coatings effect ink shift, but thats on a 
much subtler level than assuming its the paper that's yellowing.

C. David Tobie
Product Technology Manager
ColorVision Business Unit
Datacolor Inc.
CDTobie@...
www.colorvision.com


[Non-text portions of this message have been removed]