[pure-silver] Re: Polycontrast Paper Performance / Cold lite

RC papers need to be developed-out. Pulling them prematurely results in weak
blacks and uneven development. FB papers, on the other hand, can be
developed from 2 to 6 or 8 minutes with slightly increasing contrast.

Factorial development is not covered in my book (yet), but it is covered
briefly in AA's 'The Print'. Basically, you measure the time until you see
the mid-tones developing. Then, multiply that time by a factor of 4 - 8 (I
use '6') to get the total development time. Apply this consequently, and you
can make up for temperature and developer exhaustion changes, always getting
consistent contrast. It's a proven method that only works for FB papers.





Regards



Ralph W. Lambrecht




On 10/18/04 8:06 PM, "J.R. Stewart" <jrstewart@xxxxxxxxxxxx> wrote:

> Remind me, Ralph, please: "factor of factorial development"? And why does it
> apply only to fiber based paper? I don't recall seeing that described
> anywhere... (not in your book is it??--if so just tell me and I'll find
> it.).
> 
> In a related post I made this morning, I reported a significant difference
> between Ansco 120 and Anso 130M on the same paper. I wonder if the small
> differences in paper response apply to developers of the same class, e.g. MQ
> developers. Ansco 130 replaces HQ with glycin. It really has a longer scale
> in my hands. It may also be due to my use of benzo as a restrainer in my
> paper developers instead of Na bromide. Don't know.
> 
> Jim
> ----- Original Message -----
> From: "DarkroomMagic" <info@xxxxxxxxxxxxxxxx>
> To: "PureSilverNew" <pure-silver@xxxxxxxxxxxxx>
> Sent: Monday, October 18, 2004 1:36 PM
> Subject: [pure-silver] Re: Polycontrast Paper Performance / Cold lite
> 
> 
>> My one-time experience with Selectol Soft brought paper contrast down by
>> less than 1/2 grade. Since I get similar or better results with changing
>> the
>> factor of factorial development (FB papers only, of course), I gave up on
>> soft developers and the increased darkroom complexity they bring.
>> 
>> 
>> 
>> 
>> 
>> Regards
>> 
>> 
>> 
>> Ralph W. Lambrecht
>> 
>> 
>> 
>> 
>> On 10/18/04 6:24 AM, "Ryuji Suzuki" <rs@xxxxxxxxxxxxxxx> wrote:
>> 
>>> From: Charlie Thorsten <charlie_thorsten@xxxxxxxxx>
>>> Subject: [pure-silver] Re: Polycontrast Paper Performance / Cold lite
>>> Date: Sun, 17 Oct 2004 12:03:41 -0700 (PDT)
>>> 
>>>> A better alternative (besides a graded paper) is to use a higher
>>>> contrast filtration (say grade 2) and develop in a low contrast
>>>> developer like Selectol Soft.  This will bring it down to between
>>>> grade 0-1 but maintain better low values.
>>> 
>>>> In my experience, anyway. :)
>>> 
>>> Does it really work that way?  In my experience it's really hard to
>>> modify contrast by anything like 1 to 2 grades. (Lith printing is a
>>> different story.)
>>> 
>>> --
>>> Ryuji Suzuki
>>> "Keep a good head and always carry a light camera."
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