Digital BW, The Print

Steve,

I've read Voigt's work a couple of times.  What page is the yellow pigment
fade information on?

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.  

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.  

I think MIS is doing tests of the individual colors of its inks, but I have
not seen any results.

Paul
www.PaulRoark.com 


> -----Original Message-----
> From: DigitalBlackandWhiteThePrint@yahoogroups.com
> [mailto:DigitalBlackandWhiteThePrint@yahoogroups.com] On Behalf Of Steve
> Kale
> Sent: Friday, December 30, 2005 11:42 AM
> To: DigitalBlackandWhiteThePrint@yahoogroups.com
> Subject: Re: [Digital BW] On Paul's MIS vs. K3 fade tests . . .
> 
> Having read through the following I find it interesting that we have, on
> this forum, feared the use of yellow ink.  I thought that this was due to
> its perceived longevity weakness.  Yet the below suggests that this is not
> the case (of course, only in the case of the particular pigment ink
> tested).
> The article also highlights the issue of using diluted ink formulations
> rather than normal density formulations of lighter coloured pigments.
> 
> http://www.imagepermanenceinstitute.org/sub_pages/inkjet_stability_72dpi.p
> df
> 
> A test of the fade rates of individual inks rather than composites would
> highlight whether a manufacturer's inks are relatively strong across the
> board or whether they are, say, strong in some colours and weaker in
> others.
> I'd really like to see MIS K4 vs Epson K3 (and even the new Nanochromes)
> on
> this basis.  As opposed to Barbara Voigt, we know how to easily print the
> pure colour strips with QTR or IJC/OPM.  How much room do you have in your
> test facility Paul?  Maybe we should all pitch in and help you build a
> bigger one....  ;-)
> 
> 
> > From: <hogarth@...>
> > Reply-To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> > Date: Fri, 30 Dec 2005 13:51:01 -0500
> > To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> > Subject: Re: [Digital BW] On Paul's MIS vs. K3 fade tests . . .
> >
> > Paul Roark wrote:
> >
> >>> I too would like to see how linear the rate of fade is.
> >>>
> >>>
> >>
> >> I have a 600 hour read of the K3 ABW and UT7 test strips.  Consistent
> with
> >> everything we've seen, the rate of fade at the beginning is typically
> not
> >> the same as later.  I usually assume that the fade rate is higher at
> first,
> >> but I've occasionally seen apparent increases in density initially,
> even
> >> when the printing was done over a week prior to the fade test start.
> >>
> > It's conceivable that the increases in density seen early on are the
> > result of driving off the last of the glycols and glycerins. Even
> > moderate levels of light can increase the temperature of the print.
> > Increasing the print temperature helps these ink base components
> dissipate.
> >
> > I say this because I've noticed a fairly marked improvement in Dmax on
> > my prints when I dry them with a hairdryer. Even days later - you can
> > smell the glycols coming off the print and see the Dmax increase. For
> > reference I'm using PiezoTones mostly on HPR. I've seen the same effect
> > when drying UltraChromes however - not as marked, but a subtle increase
> > in Dmax and a slight increase in gamut.
> > --
> > Bruce Watson
> 
> 
> 
> 
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