Digital BW, The Print

I have been following users comments regarding characteristics of Crane
Silver Rag, Hahn. Pearl and Innova Fiber papers. I have not seen any
comments regarding any outgassing, so the question; has anyone using
these papers seen any outgassing before or after mounting behind glass
or does this paper behave like matte rag papers and therefore has no
outgassing issues?

Larry Burk

>... regarding ... Crane Silver Rag, Hahn. Pearl and 
>Innova Fiber papers. I have not seen any comments regarding 
>any outgassing, ...

I asked the Crane representative whether Silver Rag was a barrier paper
(which stops the glycols from reaching the cellulose that holds them) and
also directly whether there was an out-gassing problem.  His answer:

"As far as your question about if Silver Rag is a barrier paper, the answer
is "sort of".  It is not a barrier paper such as an RC paper with its layer
of polyethylene, however, we do apply a coating that keeps the ink receptive
coating from sinking into the base paper.  ...  It's probably best to let it
dry for some time before putting it behind glass to be safe."

I received the same sort of response from Permajet regarding it's version of
the Innova paper.  

So, while I have not actually experienced the out-gassing problem, it sounds
like we're looking at a type of barrier paper that will need to be dried
thoroughly before putting it behind glass.  Plain paper (cellulose) acts
like a sponge for these problematic glycols.  So, having the print pressed
under plain paper over night is supposed to be a good way to be sure the
slow-to-evaporate glycols are removed and do not fog the glass.

Paul
www.PaulRoark.com

Larry Burk wrote:
> I have been following users comments regarding characteristics of Crane
> Silver Rag, Hahn. Pearl and Innova Fiber papers. I have not seen any
> comments regarding any outgassing, so the question; has anyone using
> these papers seen any outgassing before or after mounting behind glass
> or does this paper behave like matte rag papers and therefore has no
> outgassing issues?
>
> Larry Burk
Outgassing is a property of the ink, not a property of the paper. I've 
certainly experienced outgassing when framing HPR, for example.

If the glycols and glycerins have not left the paper before framing, 
they can come out in the frame resulting in a greasy smudge on the 
glazing. Regardless of paper.

This (and much more on outgassing) is all in the archives of this and 
the EpsonWideFormat group. Look around and see what you find.
-- 
Bruce Watson
/
/

> Outgassing is a property of the ink, not a property of the paper. 

but its particular characteristics are somewhat dependent on both