Digital BW, The Print

The other possibility is that you started out with DSS (it's not 
called DDS), and when you switched you had first run either Epson ink 
or an ink composed of the Epson base (I've never tested this latter)- 
which cleared the printer (not 100% tho). So then you  put Piezo back 
in and it printed darker...meaning the symptoms had cleared up. Your 
initial state sounds like one of DSS. But you should check for the 
other symptoms.

The symptoms are: 1)overall lighter print with, 2) possible 
compression of shadows and highlights (not much gradient between 85%k 
and 95%k, loss of detail in highlights&shadows for example). 3) 
flattening of midtones. 4)overall appearance of contrast increase, 
sometimes resembling, 5)Posterization. Sometimes, especially in 
midtones when DSS has reached advanced stage, 6) A green appearance. 
7) Sometimes an escalated tendancy to clog is noticed.

 These symptoms may appear slowly for awhile, gradually getting worse, 
until suddenly they become exponential and dramatic. I call this 
"terminal stage". #7 (clogging) and somewhat #6 (green tone) don't 
really put in an appearance until terminal stage has been reached. 
Indeed, it is the norm to get good nozzle checks while DSS is 
progressing.

I've found that #1 and #3 are about the easiest to look for.

 Some people have the print come out green well before terminal stage, 
that's why I say "somewhat". Since our color perception differs, but 
the other symptoms get quite noticable esp. if you compare to a print 
done previously, I have encouraged people to disregard the green tone 
symptom and not use it as criteria for judging DSS. 
Jim H.




--- In DigitalBlackandWhiteThePrint@y..., "Julian Thomas" 
<julianthomas@t...> wrote:
> Paul there is evidence to suggest that batches of CIS are very 
variable. NMC
> and IJM don't buy enough to specify exactly what is in each CIS. 
This might
> explain why only somepeople get greenies or DDS.
> 
> Julian
> ----- Original Message -----
> From: "Paul Roark" <paul.roark@v...>
> To: "DigitalB&WPrint" <DigitalBlackandWhiteThePrint@y...>
> Sent: Saturday, November 17, 2001 6:18 AM
> Subject: [Digital BW] Piezo density changes
> 
> 
> > I have not followed all the discussions of density changes on the 
Piezo
> > list, so maybe some of the Piezo users can help me understand the 
density
> > changes I've observed in my Piezo prints.
> >
> > For some time I printed Piezo using an 1160 with a CIS.  The 
results were
> > consistent for quite a while.  I always noticed the green tint, 
but I
> > assumed that was normal with the ink.  (I moved away from Piezo 
mostly due
> > to my desire for a cooler tone.)
> >
> > Recently, however, the Piezo inks have become noticeably darker.  
I
> thought
> > it was the CIS, but when I loaded a cartridge it, too, printed 
dark.
> > Specifically, the magenta and yellow position inks appear to be 
darker
> than
> > I used to experience with my CIS.  Moreover, the green tint is 
less.
> >
> > So, did the Piezo ink formula change, are ink batches 
inconsistent, or was
> > my CIS causing the two lightest inks to print light and green?  
The last
> > option does not seem to be completely consistent with the fact 
that the
> CIS
> > started to print dark also, but that was only after it had sat 
with little
> > use for quite a while.
> >
> > The printer is quite consistent with the MIS inks I've been using. 
 So,
> it's
> > not a function of the printer, like clogged or worn-out heads.
> >
> > Is this a known syndrome with Piezo ink and/or the CIS?
> >
> > Paul
> > http://www.PaulRoark.com
> >
> >
> >
> > Please visit the Group Homepage to check the Files, Bookmarks, 
Polls and
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> >
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> >
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