Digital BW, The Print

Paul, hasn't Cone repeatedly stated his inks are pure pigment?  I thought he had.

jerry









Paul Roark wrote:

> Andre wrote:
>
> >Here's a snippet from a recent Jon Cone message on the other list.
>
> >"DO NOT PRINT ON EPSON ARCHIVAL MATTE!  IT IS KNOWN TO TURN GREEN IN
> >THE PRESENCE OF OZONE"
>
> >So, what's a good replacement for EAM ?
>
> I suspect it is an ink problem more than an Archival Matte problem.  The
> context of Cone's statement is a battle over the increasingly famous "green
> cast" problem(s) of Piezo prints.
>
> Look again at the comparison of ink dots made with Piezo magenta v. MIS VM
> magenta inks.  This is in the Files section of this forum.  Go to
>
> http://groups.yahoo.com/group/DigitalBlackandWhiteThePrint/files/
>
> then hit "Message Related Files" and look at file "Piezo-MISdots.jpg."
>
> The Piezo ink, I believe, has a fair amount of greenish dyes in it.  I
> beleive this "Kleenex Chromatography" experiment shows those dyes.  My
> interpretation is that the dyes, which I believe are in solution migrated
> through the Kleenex further than the pigment particles.  Now, again, I'm no
> chemist and may be mis-reading this experiment's results.  However, my fade
> testing also seems to indicate that there is a substantial dye component to
> Piezo ink.  In my experiments it fades substantially faster than MIS inks.
>
> We know that dyes are susceptible to ozone.  We also know that dyes work
> better (fade less) on Epson Heavy Weight matte paper.  Archival Matte paper
> was designed specifically for pigments, not dyes.
>
> So, I think what we have with the Piezo ink is a fair amount of dye and
> perhaps a mismatch between those dyes and the Archival Matte paper.
>
> Is there an easy and cheap solution?
>
> I found one that works for me -- switch inks.
>
> Of course, if it turns out other pigments also turn green on EAM paper, then
> I stand corrected and will re-consider my generally positive view toward
> that paper.  However, until I find a paper that performs as well as EAM in
> my fade tester, I'm reluctant to give up what appears to be a great bargain
> and excellent performer.
>
> Paul
> http://www.PaulRoark.com
>
>
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