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More info?)
Hi Bob,
I agree that a smaller ink drop doesn't necessarily mean less ink on the
page overall, because, as you stated, smaller drops likely means more of
them. However, how they would respond to UV or ozone, for instance
would in part depend on how the drops get distributed.
In high dye load colors, the lighter the color being represented, the
more spacing between the dots and the more white paper being left
between. Obviously, if a color is dark enough to be made by laying down
a solid area of ink with no discrete ink droplets, I would agree that
the area would not be altered by the size of the ink drops it is made up
of. However, in lighter areas, where discrete ink droplet are formed and
visible (under a loupe) these have less protection from UV and OZONE
simply by their relative "exposure" (at their edges).
Your second point is indeed one I just became aware of a few posts back
through my research of Wilhelm's latest set of articles. HP has
obviously done something unique in their ink formulations that actually
improves light fastness with the extra low dye load colors. As I am
sure you are aware, this doesn't hold true for other brands of ink, in
general. Wilhelm suggests that with most inks, the low dye load inks
reduces fade resistance by 2 or 3 times.
In the dye ink world, currently HP holds the title, it would appear.
Art
Bob Headrick wrote:
> "Arthur Entlich" <artistic@telus.net> wrote in message
> news:lEa4e.151533$gJ3.99041@clgrps13...
>
>
>>As I mentioned before, dye molecules are lost, in part, due to lack of
>>protection by other dye molecules. The more ink that is deposited and that
>>saturates into the paper (keep in mind picolitre is a volumetric measurement)
>>the more molecules that are deposited on top of each other, and also the
>>deeper into the surface the ink is likely to penetrate.
>
>
> But... it is not likely that a smaller drop size corresponds to less ink on
> the page. The ink limits are generally set based on the media and smaller
> drops would typically result in more drops, all else being equal.
>
> It is also not necessarily the case that lighter dye load inks would have
> poorer lightfastness. For example, see Wilhelm's analysis of the DeskJet
> 5550 - the three ink prints are rated at 15/11 years under glass/open air
> while the six ink prints are rated at 73/49 years. See
> http://www.wilhelm-research.com/ for these and other cases.
>
> Regards,
> Bob Headrick, not speaking for my employer HP
>
>