Digital BW, The Print

Robert,

I did not find any posts by George Coon. Diana York did post that 
calcium carbonate is used along with other ingredients in Post #3096.

Martin


--- In DigitalBlackandWhiteThePrint@y..., Robert Rex <chameleon@i...> 
wrote:
> I think George Coon posted something about inkjet coatings on this 
or
> another list a little while back.  As far as I know chalk or Calcium
> carbonate are not used in the coatings.  Gelatin can be used in 
coatings or
> in sizings (these are the types of coated papers JOhn Nollendorfs is
> looking for as gelatin sized/coated papers seem to offer better
> lightfastness with dye-based inks).  other coatings my include inert
> pigments and other chemicals (i think George was pretty specific in 
his
> previous post--perhaps Martin can locate this post in the archive).
> the chalk being dusted off the paper is more a result (IN MY 
OPINION ONLY
> so take this with a grain of self-serving salt) of the quality of 
the
> coating and its adherence to the paper fibers.
> have i helped to clarify your questions here?
> sincerely
> robert rex
> 
> At 02:40 AM 10/15/01 +0100, you wrote:
> >  I know very little about coatings technology - but I have 
noticed that firm
> > brushing of Somerset Velvet Enhanced results in a very fine white 
dust
> > coming off the paper!!! This does not happen, to my eyes, with 
Hahnemhler
> > papers.
> > 
> > I wonder then, if SVE uses 'straight' chalk as a coating, and it 
is this
> > that encourages the dye to commute away from the surface and into 
the
> > paper... hence it's marked warming... whereas H* does something 
different
> > which is not so based around Calcium carbonate???
> > 
> > In other words, selection of paper coating will (as we already 
know from
> > experience) that coating will dramatically effect print 
longevity, but that
> > (perhaps) pigmented inks have a harder time as the dyes are 
so 'likely' to
> > handle a coating differently from the pigments.
> > 
> > It'd be great if someone like Robert could bring some data to this
> > suggestion!!! ;)
> > 
> > Nij
> 
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