Re: Epson Stylus Pro 9600 Extrachrome
Re: Epson Stylus Pro 9600 Extrachrome
- Subject: Re: Epson Stylus Pro 9600 Extrachrome
- From: Roger Breton <email@hidden>
- Date: Fri, 12 Nov 2004 13:27:14 -0500
Having difficulty following.
> Dye inks.
HP 130 inks are light-fast dye-based inks.
> About as good as anyone has done with dyes for stability.
OK.
> If you
> want it to be archival it must lay in the layer of polymer to protect it
> against oxidation.
OK. So an additive is 'added' in the ink. That you say changes the color
property of the ink.
> The Glossy doesn¹t dry quickly at all on swellable papers.
You mean to say that if I had an instrument to measure the decay of Gloss
over time, was I measure the degree of Gloss in the HP 130 inks, I'd observe
that the ink conserves its gloss for a fairly long time? Before it changes
its optical appearance to something like matte?
> On nanoporous as per Canon it dries quickly.
Nanoporous paper by Canon? I'll bet Epson paper is not nanoporous in
comparison?
> I measured the inks over time and don¹t see that nice Epson 0.5 dE figure
> anywhere near the 1 hour mark.
OK. You say that when you measured the color of the solids in this HP 130
inks over a period of an hour, you find more than a 0.5 dE shift in color?
More like what, then? 1? 2?
> Long term stability is as stated but short
> term?
Makes you wonder 'when' in HP's vocabulary is long term starting. 72 hours?
> It¹s stable short term but you have to know that the glycol is going to
> evaporate.
Just how stable, still, Neil?
And does that glycol evaporation occurs faster or slower as a consequence of
relative humidity? Change of temperature? Should one keep the print inside
for a few hours before lugging it around to a customer? What is that mean to
us the fact that the glycol evaporates: it's it just another uncontrollable
environmental factor or is this something we can something about?
> When it does it changes the surface transparency so there is a
> shift in values.
So that glycol being used in the HP 130 inks (sorry to insist putting the
dots on the I and the lines on the t), when it evaporates, as it will sooner
or later, causes a change in the ink surface transparency? Thereby allowing
more or less light to pass through the dye layer?
> I can only assume that the inks themselves are very stable
But stable by when? And by how much?
> yet I do see the L values moving due to the surface difference.
Moving in which direction, Neil?
And what about the a and b values? Aren't those moving as well?
> As well one
> should measure these with a non touching spectro like a Spectrotable, or the
> next X-Rite Pulse.
OK.
> So the UC inks are stable quickly as the pigments are the surface,
You mean to say that the 'secret' of the UC inks resides in their inks
forming a physically stable layer on the paper?
> where as
> the HP inks are stable
You mean the dyes in the HP 130 inks are stable (rapidly)?
> , yet the surface changes.
You mean the surface formed by the dye on the paper is not stable itself
because of that glycol evaporation?
> How¹s that for a scientific
> sounding guess?
Quite good, actually.
Bottom line. The HP 130 ink formulation makes for unstable color right out
of the printer. We don't know by when they actually become as stable as the
Epson UC inks (0.5 dE). But the HP 130 inks don't exhibit Epson UC inks
illuminant metamerism, they have a constant color appearance regardless of
environement lighting, which makes them more "portable" than Epson's UC
inks.
>From the HP 130 samples I seen at that show, I don't find the Epson 4000,
7600 and 9600 to be that much sharper. But that's my assesment.
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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