Digital BW, The Print

----- Original Message -----
From: "nick90290" <NickBrandt@...>
To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
Sent: Wednesday, May 14, 2003 5:47 PM
Subject: [Digital BW] Re: Lyson SG problems


> Yes, certainly humidity can play a big factor - the only thing
is
> that
> I live in Southern California where the humidity is very low.
So at
> time of printing, humidity was almost invariably always low.

John and Henry suspect that it is possible that gelatine coated
papers accept the ink faster when the gelatine is already a bit
presoaked by  humidity, it isn't good when magenta and cyan are
together in an oxygen loaded environment like on top of the
coating, so humidity is a good thing at that moment.

When the inks are in the gelatine coating then humidity isn't a
good thing in the long run as the magenta and the cyan ink then
stay in contact with one another and the same process continues
but at a slower rate. Ilford Archiva inks more or less and with
gelatine coated papers. Don't think that this represents your
printing but it shows that it isn't simple to predict what will
work out best. Pigment inks seem to be more stable under whatever
circumstances on whatever paper.

On the colorsync list from time to time the issue of "what is the
best ink for proofing" is discussed. One of the things mentioned
is that dye ink targets never give a stable spectro reading in
time. The colour changes not only by the fading in the long run
(which isn't an important issue in proofing) but the colour isn't
stable after 24 hours like most pigment inks will be. Another
symptom that it is more complicated than we think.

Ernst