Hi Marne -
The inks contain substances like glycol which permeate
the paper and then slowly evaporate. If the print is
matted and framed, the vapors can wind up being
deposited as a film on the inside of the glass. To be
honest, the film is usually less than obvious if you
are not looking for it or if the print is not under
bright light. But, if you dismantle the frame and
remove the glass, you can see the film deposited in
porportion to the density of ink in the image - which
results in the deposited film looking like a ghost
image of the picture.
"Outgassing" refers to the process of these chemicals
vaporizing and then redepositing onto the glass.
Epson recommends allowing the print to cure for a
period of time and also using absorbent paper to soak
up some of the chemicals. That does help, and it would
never be advisable to frame a print fresh out of the
printer. But as I mentioned in my post, even older
prints can exhibit the problem.
I've also seen the chemical film form on wipe marks
left after cleaning the glass - so any residue from
glass cleaners seem to promote the deposit of the
chemicals onto glass.
The semi-gloss and lustre papers seem to be most prone
to this problem, since these plastic 'papers' really
just hold the ink in them. Matte papers seem to be
less prone to outgassing, probably because the
checmicals can move out of the front and back of the
paper sheet.
- MCC
--- [EMAIL PROTECTED] wrote:
> In a message dated 10/2/2007 7:37:04 P.M. Pacific
> Daylight Time,
> [EMAIL PROTECTED] writes:
> Almost every print had out gassing residue on the
> inside of the glass.
> =============
> Could someone explain what this is? I may have
> experienced it with some of
> my prints, and didn't realize it.
>
> TIA, Marnie aka Doe
>
> ---------------------------------------------
> Warning: I am now filtering my email, so you may be
> censored.
>
--------------------------
Mark Cassino Photography
Kalamamazoo, MI
www.markcassino.com
Photo Books:
www.lulu.com/cassino
--------------------------
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