Digital BW, The Print

Jim,

Yes coating or varnishing the prints cuts fading and warming by at least
half. A lot of work was done on this by Robert Morrison. I did a bit myself
and you can find the info in the Files section. Don't use the polyurethane.
A year later it is very yellow. The Golden materials are the best.

I sent around a traveling collection of coated prints and no one was
inspired by the look to take up varnishing. The coated surface is similar to
a varnish oil painting. The DMax is great though. Application is the biggest
problem.

Varnishing photographs was fairly common before the birth of the glossy
silver gelatin print. Strand varnished most of his prints.

Martin Wesley

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



----- Original Message -----
From: "James Downs" <silvergull@...>
To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
Sent: Saturday, September 21, 2002 12:26 AM
Subject: Re: [Digital BW] Photogravure and InkJet


I would take this information to imply that coating is a good idea for
any inkjet ink on any paper that one wants to last. Yes? The only
question remaining is the aesthetic one regarding the look and feel of
over coated fine art papers.
Cheers,
Jim
San Diego

On Saturday, September 21, 2002, at 12:03 AM, Martin Wesley wrote:

> ----- Original Message -----
> From: "Mr_Misty_44" <jharvey@...>
> To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Sent: Friday, September 20, 2002 11:17 PM
> Subject: [Digital BW] Photogravure and InkJet
>
>
> >
> >
> > I guess I'l simplify the question. What would make a simple etching,
> > say drypoint, More archival than an InkJet print using the "Archival
> > Carbon Pigment" inks and Archival paper. Is it the ink we use, the
> > solvent , the paper we use or the coating.What is the weak link here
> > or do simple etchings or Lithos suffer from the same archival
> > problems. I don't see people screaming about the archival qualities
> > of a Picasso print be it an etching or litho.
> >
> > John H
>
> John,
>
> Ernst summed it up pretty well in his earlier post which I have copied
> below. Simply put the carbon particles in the inks used for etchings
> are
> heavily encapsulated and protected from oxidation. The ink is the big
> difference.
>
> Martin
>
> ----- Original Message -----
> From: "Mr_Misty_44" <jharvey@...>
> To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Sent: Friday, September 20, 2002 6:08 PM
> Subject: [Digital BW] Photogravure and InkJet
>
>
> (snip)
>
> Photogravure uses inks with an oil medium and bigger pigments
> particles. The
> oil (linseed, alkyde) will harden on oxidation and that results in a
> strong
> resin. That is in art printing on good quality papers,
> no coating at all on the paper in any intanglio process.
> In commercial photogravure on rotating presses (rotogravure) the ink
> is an
> alcohol based varnish for faster printing with cheaper colorants. The
> paper
> is bad as well. Nation wide magazines were printed that way till the
> 1970's
> when offset replaced rotogravure.
> Photogravure has long been considered the best printing process for
> photography reproduction.
>
> The weak link is in the inkjet ink medium mainly, very little medium,
> lots
> of water, alcohol, glycol based solvent. The last disappears and the
> pigment
> doesn't have a strong bond with the paper, the pigment particles are
> not
> embedded in the varnish either. Epson pigment inks have an acryl
> encapsulation of the pigment particles (Ultrachrome matte black is the
> exception) that helps to protect the pigment, it gives a better bond
> and
> makes gloss printing possible.
>
> All the processes to get a better protection of the inkjet pigment
> layer
> like laminating or varnish coatings are done to get that same bond and
> encapsulation of the conventional printing processes. A nice example
> for
> outdoor prints is the First foil. Pigment ink is printed on that foil
> and
> after printing the foil is heated in a tunneloven. The coating is made
> of a
> resin with an reasonable low melting point (150 C.) the pigment sinks
> in the
> caoting and the coating hardens when it gets cool again. Ilford had
> something similar in the pipeline but it hasn't been released yet.
>
> Ernst
>
>
>
>
<image.tiff>
>
>
> Please visit the Group Homepage to check the Files, Bookmarks, Polls
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>
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[Non-text portions of this message have been removed]



Please visit the Group Homepage to check the Files, Bookmarks, Polls and
other resources as they are often being updated. The page is at:

http://groups.yahoo.com/group/DigitalBlackandWhiteThePrint

If you wish to receive no emails or just a daily digest, or you wish to
unsubscribe, please edit your Membership preferences by visiting this same
page.

Please follow these basic guidelines:
- Include your full name with your message.
- Include the address of your website, if you have one.
- As threads develop, trim off excess portions of earlier messages to keep
them short.
- As the topic of a thread changes remember to change the subject header.
- Good manners are required at all time. No personal attacks or
&amp;amp;quot;flames.&amp;amp;quot;
- Complete your Yahoo profile.
- Before posting a question, search the message archives and the various
resources on the homepage.




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