Digital BW, The Print

Seth,

>... was the HP paper also sprayed with Print Shield?  
>Other tests have shown that is a factor also.

I don't think the HP sample was sprayed.  It was supplied by someone else.

The spray is a factor.  However while it appears to make a major difference
with Epson UC pigments -- about 30% improvement in my tests -- it only seems
to add about 10% to the lightfastness of MIS pigments.  So, the difference
would still be dramatic.

Actually, that test had a non-sprayed sample of UT inks on Premium
Semigloss.  The difference was that the magenta channel did drop one unit.
The C, Y, and visual density were still at their original readings.  (Which,
of course, simply means the changes were too little for the X-Rite to
measure in this readout mode.)  However, the drop in the magenta channel
would not happen with the current generation of UT inks.  The old magenta
pigment, which was responsible for a number of problems in addition to
fading the fastest, has been totally removed from the entire family of UT
inks since the March test.  The new pigment, like carbon, actually shows a
slight increase in density in 600 hour tests on some papers.  So, the new
mix is much better than the older one, which already beat every inkset it
was compared to in my tests.

Paul
www.PaulRoark.com






=-----Original Message-----
=From: Paul Roark [mailto:paul.roark@...] 
=
=After 600 hours in my tester, the 50% patch of the Epson 
=Premium Semigloss
=printed with neutral MIS UT inks then sprayed with PremierArt 
=Print Shield
=and HP paper printed with their B&W inkset had the following 
=
=
=Prem. SG start: C = .58, M = .57, Y = .58, Visual Density = .58
=
=After 600 Hr:   C = .58, M = .57, Y = .58, Visual Density = .58
=
=
=HP start:     C = .80, M = .79, Y = .76, Visual Density = .79
=
=After 600 Hr: C = .78, M = .76, Y = .72, Visual Density = .77
=
=So, while the HP B&W dyes may be very good for dyes, and maybe 
=good enough
=for most uses, I don't think they are equal to the good B&W 
=pigments.  How
=all this translates into actual fading in display I don't 
=know.  However, if
=one wants the best B&W digital print resistance to fading, I think the
=predominantly carbon pigment systems are still the way to go.
=
=Paul
=www.PaulRoark.com 
=
=
=
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they are often being updated.

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ALTERATION OF YOUR TRANSMISSIONS OR DATA; (iii) STATEMENTS OR CONDUCT OF ANY
THIRD PARTY ON THE DIGITAL BW, THE PRINT YAHOO GROUP; OR (iv) ANY OTHER
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