Digital BW, The Print

Stephen,

You can go back in the archives and find the results of Robert's fade tests.
As I recall fading and warm shifting were reduced by all coatings. There was
a much greater difference between coated and uncoated than between the
specific coatings. The fade and warming were reduced by 50% in comparison to
the uncoated prints as best as I recall.

I very much doubt that any coating (or frame and glass) will prevent all UV
effects. They can do a lot to reduce it but nothing is going to stop it
completely. Coating would seem to offer more air pollution protection, at
least in the brush applied tests, because so much soaked into the print I
believe the ink particles were probably somewhat encapsulated in the coating
resin. Not unlike Epson's resin encapsulated pigments.

Coating the prints has a pronounce effect on their appearance. I have sent
coated prints to several people and the general response was that they did
not care for it. The increase in Dmax is very strong but the surface is much
like a varnished oil painting in quality.

As a compromise I would suggest using one of the UV aerosol spray coatings.
These do not change the appearance of the print if applied lightly but
provide excellent mechanical protection and improve fade and warming
resistance as well.

Also check into the coating being offered by MIS that is designed to be
loaded into a printer. You run the print through to have a coating applied
by inkjet. I have not seen the results of this process but it sounds
interesting. One of the biggest problems in coating prints was in getting an
even, streak and dust free application. An inkjet application might avoid
all these issues and you could control how much was applied by selecting
something less than 100% "black" as the print color.

Martin

----- Original Message -----
From: "Stephen Kundell, MD" <skundell@...>
To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
Sent: Wednesday, April 03, 2002 8:53 PM
Subject: [Digital BW] Coating revisited


> It has been a while since the topic of coating has been addressed. I know
Robert and others were actively experimenting in this regard.  Has anyone
come up with a system that works with large images, and truly prevents UV
and ozone degradation similar to the benefit of framed images. I hate that
glass between me and the image!!!!
> Thanks all
> Stephen
>
>
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