Digital BW, The Print

more comments,

http://tech.groups.yahoo.com/group/piezography3000/message/27416
http://tech.groups.yahoo.com/group/piezography3000/message/27417

merry whatever
Tyler


--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Paul Roark" <paul.roark@...> 
wrote:
>
> <paul.roark@> wrote:
> >
> >> ... the carbon images are the most lightfast....
> 
> Tyler wrote:
> 
> > That has not proven to be the case with some other inks.
> > I'm concluding from this and other issues mentioned over the
> > months that there are more manufacturing differences 
> > between the brands than most of us realize.
> 
> That could well be.
> 
> I would also distinguish between "carbon" only and black only.  I was trying
> to limit my statement to carbon.  Even the PKN that I've mixed is not pure
> carbon and not the most lightfast.  Also, as another example, the Epson
> "Archival" inkset black appeared to be a hybrid pigment-dye ink.  It tested
> very similarly to the first generation Piezo and MIS blacks, which I believe
> had about 8% black dye in them.  One of the problems with Wilhelm testing
> is, I believe, that he tests at densities that will not pick up a hybrid
> black ink's fading.  That's the only way the old Archival inkset did so
> well.
> 
> Then again, an "enhanced" black comes to mind that must have had just under
> 30% dye in it so that, even though the black ink faded and changed color
> horribly at first, it would not reach the 30% point at which Wilhelm
> measures "display life."
> 
> Personally, I think Wilhelm tests are great, but I need to see what the
> inkset looks like at about "20 Wilhelm years" of my own testing, at points
> that include a 100% black.
> 
> I intend to test the Canon inks soon to see how they do.
> 
> As an aside, some of the "dye" inkset black inks have been part carbon for
> quite a while. 
> 
> In addition to hybrid blacks, there is a possibility that the carbon has
> been milled so finely that the particles don't have enough size to resist
> oxidation for all that long.
> 
> Time and testing will tell.
> 
> Paul
> www.PaulRoark.com
>