Digital BW, The Print

"Peter" <pdesmidt@...> wrote:
>
> I'm trying to decide whether to go with a Carbon-6 type inkset or the 7800-EBHP inkset in my 4880. I'll be using QTR.
> 
> In his Carbon-6 inkset, Paul uses 2 channels of 30% Eboni, and three channels of 9% Eboni. 

What PDF are you looking at?  

In http://www.paulroark.com/BW-Info/Eboni-6.pdf I "re-use" M and LM for the Lk and LLk positions of K3 printers.  

The "EZ" hextone setup, such as the R2 inkset for the 220, did use, in effect, two 30% equivalent positions and three 9% equivalent positions.  This simplified maintenance (fewer inks) and gave a very good ramp with the Epson driver and no special profiles.

In my 7800 I use Eboni 100% as well as 30%, 18%, 9%, and 6% dilutions (using C6c dilution base).  I also have MIS PK, LK, and LLK loaded (for the local museum's photo restoration sepia tone printing on Museo Silver Rag).

I had previous had HP PK, Lk (30%) and LLK (9%), but found I never used them.

> What is the benefit of using multiple channels of the same dilution?

They'll help hide microbanding and with the K3 LK and LLK having different cross-overs (with the Epson driver) they'll help hide the cross-over points.  With QTR you can set up same density inks as "toners" with different cross-overs also.

I probably would not set up a wide format printer with too many same-density inks.  Actually, I think the 2%'s slightly more neutral printing argues in favor of having it in any Eboni/Carbon-6 printer.  At the dense end, the 18% can cover the gap to the K.  So, if I were redoing my 7800 I might pull the 30% and add a 2% position.

> How do the various dilutions of Eboni affect settling?

The K and the Y show the least affects of settling.  They all settle (as do all pigments; Eboni is just faster). 

 
> With regards to the HPPK and dilutions, how good of a glossy print do these make minus glop?

Bad bronzing.  That's one reason I'm looking at Claria/Noritsu K for my gallery brochures.

>(I believe that glop is fairly clog prone.)

I prefer not to use it also.

On the other hand, my 7800 with MIS PK, LK, and LLK (which use glop as their base) has been clog free with the MIS glossy inks in it.  Some have diluted the HP pigs with glop and found the bronzing to me much less than if the generic base is used.  The generic base shows about the same degree of bronzing as does the OEM base.

> Would applying Renaissance Wax to the prints minimize bronzing enough to make high quality prints?

I prefer the solvent based sprays, but they are not good for us or the environment.  (Actually, I prefer to avoid the necessity of any post printing treatment.)

Paul
www.PaulRoark.com