Digital BW, The Print

Paul Roark wrote:

>
>
> > ... 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.
>
> No, that's not necessarily correct.  The variable tone inkset image 
> that is
> printed with a neutral curve has essentially the same amount of color
> pigments as a neutral monotone inkset where those pigments are pre-mixed.
> The difference is whether the colorants are totally pre-mixed into the
> entire inkset or whether they are contained in separate inks (still 
> mixes of
> carbon and color).  Then the ratio of the separate ink and the pure carbon
> ink is varied to get a range of tones.

> Paul
> www.PaulRoark.com

I think it is necessarily correct. But I've been wrong before ;-) Please 
correct me if I'm wrong here:

The UT7 inkset appears to have two toner sets - three cool (cyan) inks 
and three warm (magenta) inks with a common black. Basically two 
quadtone inksets used together. It gets a neutral tone by mixing the 
cool and warm together. This is true, yes?

That the cool ink is cool means that it has a higher percentage of cyan 
pigment ink than the more neutral K7 does. It has to - it has a cooler 
tone. This is true, yes?

The warm side is similar - it has a higher percentage of magenta pigment 
than the K7 does. It has to to get the warmer tone. This is also true, yes?

These two inks, warm and cool, are then mixed on the paper to get the 
tone you want. This is how it works, is it not?

What happens when you print the same tone on paper with the K7 and UT7 
inksets? On paper, you get more neutral pigments with the K7 inkset. You 
get a higher percentage of color pigments on paper with the UT7 inkset. 
It's the nature of a variable tone inkset.
--
Bruce Watson