Digital BW, The Print

Steve,

I have a little trouble understanding all of Vogt's conclusions and why her
results seem at odds with others.  For example is one looks at p. 50 of
http://www.imagepermanenceinstitute.org/sub_pages/inkjet_stability_72dpi.pdf
it looks like cyan is about the most unstable pigment.  However, just above
the table the article says that while pigments were more stable than dyes,
when fading occurred "the pigments showed the same fading behavior as the
dyes."  On page 37, relating to dyes, the section on cyan starts out by
saying that the cyan was the most stable in visible light and behind glass.

Perhaps the key here is the effects of the air flow.  It appears that while
cyan is very stable behind glass, air flow and perhaps some UV that is
filtering out by the glass makes the difference.  In this respect, note on
page 29 that is appears to keep the temperature down the samples had air
flow of 1.3 m/s.  That strikes me as quick a lot of air flow.

I suspect part of what all this points out is that we can't be too sure just
how stable our materials are in different circumstances.  I'll just use the
best materials I can and protect them as much as possible.  

Paul
www.PaulRoark.com 


> -----Original Message-----
> From: DigitalBlackandWhiteThePrint@yahoogroups.com
> [mailto:DigitalBlackandWhiteThePrint@yahoogroups.com] On Behalf Of Steve
> Kale
> Sent: Saturday, December 31, 2005 12:15 PM
> To: DigitalBlackandWhiteThePrint@yahoogroups.com
> Subject: Re: [Digital BW] On Paul's MIS vs. K3 fade tests . . .
> 
> 
> 
> 
> > From: Paul Roark <paul.roark@...>
> > Reply-To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> > Date: Fri, 30 Dec 2005 13:43:34 -0800
> > To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> > Subject: RE: [Digital BW] On Paul's MIS vs. K3 fade tests . . .
> >
> > Steve,
> >
> > I've read Voigt's work a couple of times.  What page is the yellow
> > pigment fade information on?
> 
> Pg 49
> 
> >
> > This RIT test for MIS is what most of us have probably seen:
> > http://www.inksupply.com/rit.cfm
> >
> > My view has been that yellow is weak, but magenta is the real 
> > problem.  This
> > is, in part, because I need it, as opposed the yellow.
> 
> Yes she found the same.
> >
> > I think it's generally agreed that the colors are more lightfast 
> > than the carbon.  In the old MIS test, note that that black ink 
> > was probably a hybrid.
> >
> > The cyan fade -- or lack of it -- is most impressive in the MIS test.
> >
> > As to the light ink fade problem that was much more of a problem with
> dyes.
> > The pigment particles are the same size regardless of dilution.  The
> > difference in the pigmented inks is that the dilute inks do not benefit
> from
> > the protection they seem to enjoy when in piles.
> 
> Read the conclusion on pg 50.
> 
> 
> 
>