Re: question for silver gelatin users

From: Ryuji Suzuki ^lt;>
Date: 11/29/04-04:22:08 AM Z
Message-id: <>

From: Kate M <>
Subject: RE: question for silver gelatin users
Date: Mon, 29 Nov 2004 22:38:23 +1300

Thanks for your response... It's always interesting to compare what
people do (against what I tried, currently do, and thought about).

> Sizing related:

> - how do you size? (brush, roller, dipping, etc.)
> I size by bath. Two coats, 12-24 hours drying between.

Is it better than brush application? Or is it just to save work? I
tried sizing by immersion but unless I size small pieces and hung dry,
there is no way to dry the paper without damaging it. (The sizing
solution sticks paper to whatever after drying.) I ask this because I
sometimes suspect that quality/uniformity of sizing affects uniformity
of emulsion coating rather significantly.

> Emulsion coating related:
> - how much solution do you coat (specify size)?
> Per suare metre? I don't measure....

Per square (deci)meter or 22x30 inches or 80 square inches or whatever
unit... but if you don't measure...

For my current chlorobromide enlarging emulsion, standard coating
weight is 80-100ml per sq. meter (2.5+g AgX/sqm). 100ml gives me very
nicely dense black in shadows. But this level of coating can be
achieved with two thick coats or 3+ thin coats using foam
roller. I wonder if this is what people do as well. (I used to make
emulsion thicker than typical and also used to make thicker single
coats but I didn't like the results. My current emulsion is not very
optimized but the image looks crisper, the emulsion is considerably
easier to make also taking less time to make a batch.)

> - how do you coat? (brush, roller, dipping, etc)
> Brush first, then roll for a smooth surface. I find that applying by
> roller I always get bubbles. Can't get a decent smooth surface roller
> here (or can't find where to get one)

Doesn't the emulsion stick to the roller? (What kind of roller is it?)

I use fine grain foam roller, but unless I maintain emulsion viscosity
rather tightly, the coated paper surface turns out mottled/speckled
and this is quite ugly. To suppress bubbles, I have to use quite a bit
of surfactant and antifoaming agent, and then immerse the roller in
the emulsion in the dish, roll back and forth a few times to soak and
squeeze out the emulsion. Then coat. Quite a bit of emulsion gets

Ryuji Suzuki
"People seldom do what they believe in.  They do what is convenient,
then repent." (Bob Dylan, Brownsville Girl, 1986)
Received on Mon Nov 29 04:22:24 2004

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