QTR-Quadtone RIP

(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 


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