[pure-silver] Re: printing Kodak's C-41 "black and white" fil m

Kodak has replaced their two B&W chromagenic films with a single film Kodak
Black & White / BWC.  This film is optimized for printing on color papers
intended for machine processing.  While prints can be made on conventional B&W
papers this film presents quite a few problems.  Kodak's technical publication
F-15 is about this film.

Jerry

-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx]On Behalf Of Richard Knoppow
Sent: Wednesday, September 29, 2004 10:30 PM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: printing Kodak's C-41 "black and white" film



----- Original Message ----- 
From: "shannon stoney" <sstoney@xxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Wednesday, September 29, 2004 6:31 PM
Subject: [pure-silver] printing Kodak's C-41 "black and 
white" film


>I experimented in August with shooting Kodak's "black and 
>white" film
> that can be processed at a one hour lab.  Some of my 
> friends love
> this film.  But, when I went to make the contact sheets, 
> they seemed
> to require a lot more exposure time and the results looked 
> rather
> flat.  Has anybody printed with this film, and if so, what 
> are your
> feelings about it?
>
> --shannon

    Kodak has a couple of films, which one are you using? 
All of their chromogenic B&W films have an orange filter to 
simulate the color masking built into color films. The 
reason is to allow printing neutral images on color printing 
paper. The main difference between consumer and pro film is 
the amount of this mask. In consumer film the mask is 
stronger to yield neutral images without changing the 
settings used for color on one-hour machines.
    The masking in both films tends to upset the color 
balance of the variable contrast filters and to lengthen the 
exposure time when used with conventional B&W variable 
contrast paper. The use of a panchromatic paper, like Kodak 
Panalure, will shorten the exposures but this is a graded 
paper and is expensive. About all you can do is to 
experiment with the VC filters on your parcitular enlarger 
to find which gives desirable contrast and increase the 
exposure time to whatever is required.
   Ilford's chromogenic B&W film does not have a mask and is 
intended to print on B&W paper. It produces a color cast on 
color paper unless substantial equalizing filtering is used 
but it is not intended primarily for that. On the 
conventional materials it is designed for it is superior, at 
least in that it doesn't require handling differently than 
silver based B&W film.

---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx 

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