QTR-Quadtone RIP

Paul,

As you note, the Piezography Sepia inks do not need anything to make them more stable. It is pure carbon and has great longevity on its own.

But, I think Mark probably is testing examples on both pigment and dye with UV sprays, and if he reads this list can answer with some authority on the subject.

Best,

Jon





--- In QuadtoneRIP@yahoogroups.com, Paul Roark <roark.paul@...> wrote:
>
> (Sorry if this is too OT, but the issue was raised here.)
> 
> Jon or others,
> 
> ... Piezography pure Carbon full ink sets are leading the OEMs in longevity
> > for b&w at Aardenburg ...
> >
> I obviously agree with Jon here.  The 100% carbon inksets can easily beat
> the OEM inksets with respect to longevity.
> 
> I briefly looked at the Aardenburg fade tests of Piezo Carbon Sepia.  I
> noticed 2 were with Hahnemuhle papers (Photo Rag 188 and W. Turner).  One of
> those was sprayed and one not.  Yet the results look about equally
> excellent.  (Papers, of course, can make a significant difference in
> results, but ...)
> 
> This brings up an issue about which I've never really seen convincing
> evidence.
> 
> Regarding longevity of 100% carbon inksets only, does using these sprays
> provide any significant   boost to their light-fastness?
> 
> We do have evidence that for the dyes they can make a significant
> difference, and I'm quite sure tests support that UC pigments benefit from
> the spaying.  Other tests I'm aware of appear to show a benefit from sprays
> for the blended B&W inksets.  But I'm focusing just on 100% carbon here.  I
> don't recall any tests that show one way or the other.
> 
> I do think sprays add to abrasion resistance marginally, but they also lower
> dmax.
> 
> I, personally, would be very happy if 100% carbon inksets were lightfast
> enough that those who use them can feel comfortable in NOT using the
> (usually toxic) sprays.
> 
> Paul
> www.PaulRoark.com 
> 
> 
> [Non-text portions of this message have been removed]
>