Digital BW, The Print

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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