Digital BW, The Print

I believe we had to clarify this back then as well. Pretty sure the point was that they 
contain no dye, not no color. Jon went on to explain that each "dilution", for lack of a 
better term, was individually dealt with for neutrality. I would assume that this must be, at 
least partially, dealt with by color addition, and since not dye, then pigment.
I think Jon was careful to never state there is no color pigment in the mix.
Tyler

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "mjvendrell2" <mjvendrell2@y...> 
wrote:
>
> I thought I understood from an e-mail from Jon Cone and his reply to 
> Clayton Jones that the K7 did not contain any color pigments, but 
> only Carbon and that the 'tone' was controlled by such proprietary 
> things as particle size, etc.  I am inviting correction and/or 
> clarification on this, however...
> 
> Michael Vendrell
> 
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, hogarth@s... 
> wrote:
> >
> > Paul Roark wrote:
> > 
> > > Bruce wrote:
> > >
> > > > The main disadvantage is the possibility of
> > > > differential fading over time pushing the print's tone warmer 
> or cooler
> > > > than you intended.
> > >
> > > No, there should be no significant difference here.  I believe 
> the K7 inks
> > > have differing amounts of color pigments mixed in.  I may be 
> wrong 
> > > here, but
> > > I simply don't know of any pure carbon pigments that can print 
> neutral 
> > > over
> > > the entire range of densities we're interested in.  It'll really 
> take
> > > controlled, comparative fade testing to see what, if any, aging 
> > > differences
> > > there are from these inksets.  The differential fading problem 
> occurs with
> > > color inksets that attempt to make a gray tone from color inks.
> > >
> > > A "neutral" tone that is composed of predominantly carbon will 
> usually 
> > > have
> > > some color pigments mixed in.  These will fade faster than the 
> carbon, but
> > > the carbon also shifts color.  So, there will be color change in 
> either
> > > case.  What usually dominates in a reasonable time span (like 
> one's 
> > > expected
> > > life span for normal display conditions) is the warming of the 
> > > carbon.  (If
> > > you're using brightened paper, the burning out of the optical 
> brighteners
> > > may be the largest change -- which is a big reason I prefer 
> paper with no
> > > OBAs.)
> > 
> > First, I don't know the compositions of the various inks. I don't 
> see 
> > anything on the InkJetMall site that uses the words "carbon 
> pigment" 
> > however. I'm not even sure I now how a carbon pigment ink differs 
> from a 
> > pigment ink. Probably in the amount of carbon, but I have no idea 
> where 
> > that line is drawn.
> > 
> > Second, I didn't say there would be any differential fading. I 
> said 
> > there was a possibility of differential fading. It stands to 
> reason that 
> > the possibility of differential fading would be greater for the 
> inkset 
> > with the most color pigments. And a variable tone inkset is going 
> to 
> > have to have more color pigments than a fixed tone inkset. It's 
> the 
> > color pigments that provide the "variable" in the variable tone 
> inkset 
> > after all.
> > 
> > That doesn't mean that the variable tone inkset will exhibit 
> > differential fading. That the possibility is greater doesn't mean 
> that 
> > the actual amount of differential fading will be noticeable or 
> > objectionable.
> > --
> > Bruce Watson
> >
>