Digital BW, The Print

Ernst,

>... Right now I get better Dmax
> with the HP Vivera on Photorag than I got with MIS Eboni.
> 1.67 versus 1.77 D. ...

Is the HP black a 100% pigment ink?

Apparently the HP machines use 4 inks for the 100% black. These include
the light gray inks.   The use of all these inks at once is said to be
what is behind the high matte paper dmax.  This is certainly different
than my experience with pigment inks in Epson printers.  The only time
I've seen addition of an LK to the 100% spot raise the dmax is when the
K is not covering well.  If the MK is covering well, I almost always see
a decrease in dmax when a lower load ink is added to the mix.

I believe Wilhelm tests do not pick up a hybrid black, which my testing
indicates included the original Eposn 7500 Archival K.  So, a good
Wilhelm rating may not be a guarantee that the black ink is not a
hybrid.

I'm very curious how HP is getting the results they are.

Paul

www.PaulRoark.com <http://www.PaulRoark.com>





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