Digital BW, The Print

Paul Roark wrote:

> Next, Ink Jet Control was used to print with the 2400 and MIS ink, but no
> yellow was used.  As such, while the print tone was matched reasonably well,
> less color ink was used for the print.  The goal here was to see what impact
> the ABW mode's use of the excess color inks has on lightfastness.
> 
>  
> 
> MIS IJC control:  59.82, 0.71, -1.45
> 
> MIS IJC test:      60.15, -0.17, 0.99
> 
>  
> 
> MIS IJC change: 0.33, -.88, 2.44  
> 
>  
> 
> (Notice the much higher yellow shift, due, I believe to the lack of
> relatively fast fading yellow inks in the mix.  A fast-fading yellow was
> used by me in the original FSN as a "counter-shift" strategy to offset the
> warming of that older generation of ink.  I don't recommend such a strategy
> for modern inks, however.)
> 
>  
> 
> Finally, the same MIS pigments were used in a blended, dedicated B&W ink, in
> this case made for the C86 just for this test.  The point here was to see if
> the color inks mixed in with the carbon produced different results than if,
> as in the IJC test above, the color inks were applied as pure colors in
> separate dots.
> 
>  
> 
> MIS blended B&W control: 57.13, 0.47, -2.01,
> 
> MIS blended B&W test:     57.36, -0.42, 0.34
> 
>  
> 
> MIS blended B&W change: 0.23, -0.89, 2.35 
> 
>  
> 
> (Note almost the same tone changes as the IJC, but with less density loss.)
> 
>  
> 
>  
> 
> So, it tentatively looks like, at least on EEM, the ABW mode's use of the
> excess color inks might cause increased fading, but more tone stability.
> The inks being blended in a dedicated B&W inkset may lead to even less
> fading.   While this is just one initial fade test, it looks like the
> ultimate lightfastness may be from the dedicated B&W inksets.

Paul,

You will continue this test ?  Wonder whether the lower 
density loss in the blended set is a result of the energy gone 
in the toner fading and that a longer exposure will bring the 
same density loss for both samples after all. The toner loss 
is so similar in both examples.

Is there also a measurable shift in the paper itself ?

I actually expected that the blender mix would keep its tone 
better and the density loss  would be the same, shows that 
tests tell more than theory.

Of all the fade tests you have done so far, how well did the 
MIS colors behave compared to the UC sets in general ?

Ernst

                    --
           Ernst Dinkla


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