Digital BW, The Print

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Paul Roark" 
<paul.roark@v...> wrote:
> 
> 
> > ... Much to Bill Bergh's dismay, the IJM's Carbon
> > Sepia inkset, which he designed as supposedly pure carbon, fell
> > slightly short of the other sets that do have color pigs mixed 
into
> > them for hue, in their RIT tests. There seemed to be some positive
> > symbiotic effect on longevity.
> >...
> 
> I never understood that either.  With the UT inksets the pure 
carbon is the
> strongest in my fade testing.  Wilhelm also seems to be endorsing 
the
> concept that carbon is the strongest of the pigments (relative to 
those in
> the UC inkset).  That said, the cyan is extremely strong also.
> 
> Paul
> www.PaulRoark.com

Surface area? With the particles spread that much thinner over the 
same area, there would be more particles exposed to the light/air. 
Well that's my guess anyway. Doesn't really explain why a mix works 
better.

Also brings up the question of BO prints. Do the lighter patches fade 
more quickly than the darker patches? That would be one way to check 
the surface area theory.