[pure-silver] Re: Cleaning a Drum Dryer
- From: "BOB KISS" <bobkiss@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Tue, 3 Apr 2007 09:12:35 -0400
DEAR RICHARD,
I believe the baryta (barium sulfate) coating is under the gelatin
layers and not suspended in them (Neblette, Mees & James). Recently I tried
etching out a black spot in a print with a sharp tool instead of bleaching
it out (or spotting the neg) and was a little over enthusiastic. I saw the
image/gelatin layer(s?) come off and found the nice powdery white layer
underneath. Good thing I had more prints!
CHEERS!
BOB
-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Richard Knoppow
Sent: Monday, April 02, 2007 10:54 PM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: Cleaning a Drum Dryer
----- Original Message -----
From: "Bill Stephenson" <photographica@xxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Monday, April 02, 2007 3:15 PM
Subject: [pure-silver] Re: Cleaning a Drum Dryer
> Amateur stepping up to bat: *why* does no one ferrotype
> prints these days? With that rotten plastic paper, I can
> understand it, but there's still some good *real* paper
> (requiring the death of trees) out there. I always
> thought that an "F" (Kodak's designation for glossy)
> print, ferrotype-dried (hot or cold), was the bees knees
> for showing fine detail and incredibly long tonal scale.
> But...what do I know? I can't even be sure that I can get
> into trouble, although I'm a fair hand at messes.
>
> -Bill
There is a misaprehension above, RC paper _is_ made of
paper but its coated on both sides with plastic and has a
different reflective layer. There is just as much paper in
it as in "fiber" or more correctly untreated paper.
One reason that RC looks different is the reflective
layer. Fiber paper has one or more layers of hard gelatin
made reflective by including a suspension of Barium Sulfate
as the reflective material. RC paper has a suspension of
Titanium Dioxide in the front coating of plastic. This
plastic coating can be made mirror smooth so RC "glossy"
surface is very glossy without any after treatment. Fiber
glossy has an overcoating of gelatin. When its dried in
intimate contact with a smooth surface the result is a
glossy print. At best fiber glossy is just as mirror smooth
as RC glossy.
Glossy prints are still associated with mass produced
prints and photofinisher's prints, i.e., cheap. Despite this
the glossy surface has the longest range of gray scale of
any surface.
Ferrotyping can be carried out in several ways.
Probably the best quality, and certainly the simplest
method, is to dry the prints after rolling them in contact
with flawless chrome plated sheets. Other materials can be
used, even glass, but must be polished down and waxed or
else the emulsion will stick to them. Once stuck a print is
almost impossible to remove without some damage. Actually, I
rather like glossy prints but they require careful lighting
to avoid strong specular reflection from the surface.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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