Digital BW, The Print

> ----- Original Message ----- 
> From: "rr6x7" <rsr2500@...>
> To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Sent: Thursday, May 22, 2003 2:28 PM
> Subject: [Digital BW] Ultrachrome outgassing ?
>
>
> > After letting  2200 prints (on Epson paper) dry for several
days and
> > then, matting and framing, I notice a film deposit under the
glass
> > that matches the image. It happens in as little as 3-4 weeks
and
> > really dulls the appearance of the photo(b&w or color)and
must be
> > cleaned. Forced drying helps to greatly reduce this problem.
> >
> > I have seen this problem with older ink jet prints also. Any
thoughts
> > on this?

It has been discussed on the Epson Leben list a long time ago.
Happened with dye inks too. Possibly glycol, alcohol that
evaporates from the print that takes another fraction glycerol,
PVA with it and condenses on the glass in front. With light
falling on the darker parts of the print behind the glass there
can be more temperature buildup in those parts and a direct
transfer to glass that is colder is possible. Maybe static
charges help in that transfer and reduce the spread of the
condensation. There were other hypothesi though.

Ernst