Re: negative intensification

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From: Carl Weese (cweese@earthlink.net)
Date: 08/23/02-01:24:12 PM Z


Victor,

Thanks. I'm glad to see a confirmation of the Gainer method from PT. I'd
assumed he was correct but it's always nice to see a procedure confirmed by
another worker.---Carl

--
        web site with picture galleries
        and workshop information at:
        http://home.earthlink.net/~cweese/
----------
>From: Victor Loverro <victor.loverro@verizon.net>
>To: alt-photo-process-l@sask.usask.ca
>Subject: Re: negative intensification
>Date: Fri, Aug 23, 2002, 11:22 AM
>
>   The method I have been using is the one described by Patrick Gainer in an
> excellent article in the Mar/April 2000 Photo Techniques titled "More
> Pyrotechnics."  It is a bleach and redevelopment in PMK process.  I have
> used it on negatives that were initially developed in non-pyro developers
> that were almost too thin for silver printing.  I have not done alt-process
> printing, but I use the negatives for POP printing on the Centennial paper
> which requires a fairly contrasty negative.  The negatives also print much
> better on regular silver paper.
>   For the bleach:
>   2 tsp. potassium ferricyanide
>   1 tsp. potassium bromide
>   add to 1 pint of water.
>   Bleach the negative until there is no more black silver image.  This may
> be done in normal room light.  Wash thoroughly before redevelopment.  It is
> important to expose the negative to bright light after bleaching and before
> redevelopment.  Then develop in PMK.  I use the normal times recommended for
> whatever film I am using.  There is no need to fix after and no need to
> return to developer.  If more contrast/density is needed, the process can be
> repeated.  One caution:  make sure the negative you use is thoroughly fixed
> and thouroghly cleared of any fixer.  Any residual fixer may cause streaking
> in the redeveloped negative.
>
>
> ----- Original Message -----
> From: "Carl Weese" <cweese@earthlink.net>
> To: "altphotolist" <alt-photo-process-l@sask.usask.ca>
> Sent: Friday, August 23, 2002 9:09 AM
> Subject: negative intensification
>
>
>> Many alternate processes require negatives with more contrast than
> "normal".
>> Some films can easily reach the needed level of contrast simply by
> extending
>> development, others do not respond as well. Intensification to increase
>> contrast is another way to get long scale negatives. I'm interested to
> know
>> if anyone on the list uses this approach routinely, or as a normal
>> corrective procedure. If so, what methods have proved most useful?
> Selenium
>> looks like the simplest procedure, but there are others and I'm curious
>> about results.---Carl
>> --
>>         web site with picture galleries
>>         and workshop information at:
>>
>>         http://home.earthlink.net/~cweese/
>>
>
> 

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