On May 2, 1:57 am, David Nebenzahl <nob...@[EMAIL PROTECTED]
> wrote:
> On 5/1/2008 3:06 AM Steven Woody spake thus:
>
>
>
>
>
> > On Apr 30, 10:54 pm, t...@[EMAIL PROTECTED]
(Thor Lancelot Simon) wrote:
>
> >> In article
<3af4c15b-53eb-4aaa-b2d3-a0fe88e2a...@[EMAIL PROTECTED]
>,
>
> >> Peter <w2...@[EMAIL PROTECTED]
> wrote:
>
> >> >Generally speaking the runway behind you is of no practical use in
an
> >> >airplane and the liquid (more than a few molecules) above the paper
is
> >> >not of much use, either. Still, you have to keep it evenly wet and
> >> >circulating (normally with intermittent agitation) for even
> >> >development.
>
> >> Are you using your developer one-shot, or reusing it? With such
small
> >> solution volumes you run the risk of changes to the paper's
characteristic
> >> curve because the developer itself can become exhausted over the
course
> >> of developing a single sheet of paper, giving different contrast in
shadows,
> >> midtones, and highlights.
>
> > oh.. i thnk i lost the answer. i think i should ask this way:
> > what's the usual height of solution required for smoothly develop
> > 16x20 papers in tray? i hope this way you experts can understand me
> > better.
>
> Since nobody else here can seem to understand, let alone answer, what's
> basically a simple question, might I suggest that you answer it
> yourself? Assuming you have the trays you want to use, just fill them
> with water to the minimum height you think you'll need, then pour out
> the water and measure it. (If you don't actually have those trays, then
> you'll have to do a volume calculation, based on the area of the tray
> multiplied by the height of the developer solution, which you can again
> determine empirically.)
>
> This is what you wanted to know, right?
>
Dear David, I think you don't understand. My problem is actually that
I am not sure what the solution height is safe to smoothly processing
paper. I want to use 1mm to get minimal soution volumn, but everyone
knows that 1mm is not safe, I can use 30mm to ensure it's safe, but
you know 30mm means almost 4 liter for a 12x16 tray. So, my question
is just the solution height, without the heigth, I can not do any
experiment or calulation. By reading replies in this thread, I now
think 12mm is a safe solution heigth. So, I need 1.5 liter for 12x16
or 1.2 liter for 11x14.
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