Digital BW, The Print

I also think that this is an excellent question. I will hazard a couple of
guesses though. Gravure controls tone by varying the depth of the etching of
the plate I believe or it can be a half tone process. I suspect that the
main advantage over inkjet is that the ink is literally forced into the
paper under pressure. The inks are very thick, a paste actually so that
bleeding on porous papers is not an issue. By impregnating the paper the ink
would be less exposed. With inkjet bleeding on uncoated papers is a problem
because the ink is very thin. So the papers are coated leaving the carbon
particles of the ink sitting on the surface where they are more subject to
oxidation and in addition we do not know what role the paper coatings may
play in longevity.

I do recommend group Strange Ross's site at http://www.psy.ku.dk/ross/ for
information on making plates using digital negatives.

Martin Wesley

http://www.borderless-photos.de/guests.html



----- Original Message -----
From: "Austin Franklin" <darkroom@...>
To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
Sent: Friday, September 20, 2002 9:12 AM
Subject: RE: [Digital BW] Photogravure and InkJet


> > Can anyone explain to me what
> > in the process of Quad B&W printing using MIS Carbon inks would make
> > the print less archival than a Photogravure. Is the weak link in the
> > coatings, Ink, Solvent...What. Or is there no differance.
>
> John,
>
> An exceptionally excellent question!
>
> http://www.curtis-collection.com/process.html
>
> it appears to me that photogravure process has to use some kind of
> halftoning technique to get tonality, as it only uses a single ink.  Does
> anyone know more about this?  I have a book with photogravures in it, that
> I'll take my magnifier out and look at, out of intellectual curiosity...
>
> Austin
>
>
>
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