Digital BW, The Print

"sinar001" <jnolly@...> wrote:

> I'm getting a d-max of about 2.4 on the Ilford Gold Silk, with my
> Z3100. I'll check that again tomorrow when back in the studio.
> 
> Sounds like your HP ink dilutions are working well! 

So far so good.

> Have you done any research on exactly how HP is treating 
> their ink to get the neutral tone? 

One of the list members recently sent me and HP patent that appears 
to be on point.  I've posted it at 
http://www.paulroark.com/BW-Info/HPpat7452415.pdf

Assuming this is the one that relates to the HP neutral gray and PK 
inks, it looks like a neutralized carbon using the same general 
approaches we've used for some time.  The difference, of course, is 
that HP has access to virtually unlimited materials and resources.  
They appear to have put a lot of effort into matching the pigment 
characteristics such that the fade path will not go to green or the 
like on its way to carbon warm.  They may also be using a counter 
fade strategy like I used with the first FSN. 

Paul
www.PaulRoark.com