Digital BW, The Print

On 05/29/2011 05:32 PM, Paul wrote:
> I've found the 2:1 dilution of HP PK with MIS glop (33% PK, 67% Glop)
> at 100% with QTR has a higher dmax than the 100% HP PK, no bronzing,
> and no more overnight dry-down than the 100% HP PK.  On Canson
> Baryta, the next day 33% HP/67% Glop is at 2.49 density, and best
> 100% HP PK, using a boost to 80% with QTR, is at 2.3. There is a
> visible difference.  Both approaches look very good; the dilute HP PK
> looks a bit better.
>
> If the Epson driver is used, the 100% HP PK hits a higher dmax.  It's
> the ability to have a very high ink limit that allows the HP + GO to
> do so well.
>
> The numbers suggest to me that a 1:1 mix may be even better.  I'll
> give that a try soon.
>
> The 33% HP + GO on Red River Metallic comes the closest to the look
> of the dyes that I've seen from a pigment.  Still, however, the
> surface of the card is different.  With the pigs you can tell they
> are sitting on top of the paper.  There is a bit of a gloss
> differential with the pigs.  The very high ink limit blacks have a
> glossier look than the middle values.  On the other hand, no
> metamerism with the HP + GO gives that approach an advantage with
> fluorescent lights.
>
> Paul www.PaulRoark.com

Paul,

You already answered some questions I had in relation to the HP Vivera 
quad mixes and Claria quads. If price is also considered then the HP 
(diluted PK) quad becomes even cheaper than the Claria quad. But 
printing on matt papers is not delivering a decent black with PK. So 
less versatile. For duplex printing, book creation, I guess the Claria 
solution delivers less issues when pages are in contact with one 
another. Any thoughts on that?

Is the effect of a higher Dmax by diluting the PK (even to 1:1) plus a 
higher ink limit, not described with what a black dye ink does, 
penetrating the coating deeper, not reflecting the light at the surface 
and by that creating a better light trap? A better gloss may help then 
too. If so it might give a better Dmax on matte papers too than the 
standard PK. I also wonder whether the changes you made to the Vivera PK 
with GO have an effect on the fade resistance.

Some differences I found between the B&W output of the Z3200 and Z3100 
could be explained if the Z3200 lays down too much PK. I have to check 
that again.

-- 
Met vriendelijke groeten,   Ernst

Try: http://tech.groups.yahoo.com/group/Wide_Inkjet_Printers/

|      Dinkla Grafische Techniek      |
|         www.pigment-print.com        |
|                 ( unvollendet )                 |