Re: VDB
Sandy King escribió:
You are smart to work in a humidified environment. The difference in
potential Dmax in VDB between working at RH of 35% and RH of 55% is
significant, with much advantage to the higher RH. At 35% RH and
single coating I am lucky to get a Dmax of 1.30, whereas at 55% Damx
is usually 1.45 or higher.
In the winter I run a humidifier in the workroom whenever I plan to
print with VDB, kallitype or pt./pd. It is the type that turns off and
on to adjust to a certain RH, and I keep it set for 55% RH. Don't just
turn it on and start printing when the room RH reaches 55%. You need
also to make sure that the paper has had enough time to absorb
moisture from the air to reach equilibrium at the same RH.
Sandy King
At 3:02 PM -0500 11/9/07, Jordan Wosnick wrote:
On Nov 5, 2007 1:06 PM, Sandy King <sanking@clemson.edu
<mailto:sanking@clemson.edu>> wrote:
However, like Loris I have found that I get as much or more Dmax
by single coating and then toning before fixing. Yes, toning
changes the color of native VDB, but then again a toned VDB
should be theory be much more archival than an untoned one.
BTW, I used to always double coat, but I found that with
palladium and kallitype it was much more difficult to remove the
stain than with single coating. I don't have any trouble with
stain with VDB so in theory could double coat all the time, just
don't find it necessary.
This is encouraging, because I find that many of the problems I have
with VDB are the result of the double-coating process (e.g. the first
coat goes on fine, but the second one gives me problems with
blotchiness). I routinely print my VDBs in a humidified environment
and tone them with palladium before fixing anyway, so maybe I can
dispense with the second coat and get more consistent results...
Jordan
--
Jordan Wosnick
jwosnick@gmail.com <mailto:jwosnick@gmail.com>
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Hello to all:
For my kallitypes I use double coating. I try to maintain the humidity
from my room to 55%, like Sandy says, but I have noticed:
1. - if I humidify the brush with water distilled before applying the
emulsion layer, as much in the first one as in the second layer, it
produces some very big inequalities in the covering, for what I have
stopped to humidify the brush.
2. - if the paper is not highly dry (very dry) among a layer and other,
it also produces the same effect that the humid brush. They can be
appreciated the prints of the brush perfectly, with that that in oneself
area of Dmax inequalities and dissipations of the color are appreciated.
The time of drying between a layer and the following one is
approximately of 30 minutes in summer and of 60 minutes or more in winter.
My paper option is Arches Platinum, but I prime for the reverse of the
paper, the roughest side.
Thank you and pardon for my English, text translated by computer.
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