Re: Phenidone in Pyrocat-HD

Ryuji,

I used a very small amount of sulfite in the tests, probably
somewhere between 1g - 4g per liter of working solution. Don't
remember for sure if I used any bromide but I think not. I used
sodium carbonate for the accelerator so the pH must have been
somewhere between 10.7 - 11.0.

I definitely recall that development times were rather long, say in
the 15 minute range for CI of .55. In fact, the long times were the
reason I looked to a second reducer for more synergism since.

Sorry, but that is the best I can do from old memory, and even this
may be suspect.

Sandy

>From: Sandy King <sanking@clemson.edu>
>Subject: Re: Phenidone in Pyrocat-HD
>Date: Fri, 04 Mar 2005 10:16:31 -0500
>
>> [...] as I recall the use of pyrocatechin as the only reducer
>> resulted in much longer development times, less effective film speed
>> and very large grain, but very good acutance.
>
>Sorry to ask more about old memory, but this is interesting. Do you
>also recall how much sulfite and bromide did you put in the solution,
>and the pH of the bath as well?
>
>Did the developed film have low Dmax and/or lower exposure to reach
>the Dmax?
>
>In purely chemical developers, especially in midtone and highlight
>areas, finer and longer filaments grow from the crystal and this
>generally makes apparent grain (which is actually like a steel wool)
>bigger. Slower development makes filaments thicker (and thus shorter
>and less fluffy). Mild solution physical development can modify the
>filament morphology further. With more physical development, image
>becomes to look more grainy but this tends to begin in midtone.
>
>--
>Ryuji Suzuki
>"Well, believing is all right, just don't let the wrong people know
>what it's all about." (Bob Dylan, Need a Woman, 1982)
Received on Fri Mar 4 10:46:38 2005