Re: Phenidone in Pyrocat-HD

From: Delphine Chapuis ^lt;delphinecha@hotmail.com>
Date: 03/04/05-09:22:05 AM Z
Message-id: <BAY104-F20FEA550E9C904768AF31DB25C0@phx.gbl>

Ok, thank you very much.

Delphine Chapuis

>From: Sandy King <sanking@clemson.edu>
>Reply-To: alt-photo-process-l@sask.usask.ca
>To: alt-photo-process-l@sask.usask.ca
>Subject: Re: Phenidone in Pyrocat-HD
>Date: Fri, 04 Mar 2005 10:16:31 -0500
>
>I did these experiments some seven or eight years ago and have since lost
>my notes, but 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. In those tests I remember that I
>used pyrocatechin in amounts ranging from about 0.5g up to 4.0g per liter
>of working solution.
>
>Sandy
>
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>
>
>
>
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>
>>Sandy,
>>
>>And what was the result with Pyrocatechine only?
>>
>>Delphine
>>
>>>From: Sandy King <sanking@clemson.edu>
>>>Reply-To: alt-photo-process-l@sask.usask.ca
>>>To: alt-photo-process-l@sask.usask.ca
>>>Subject: Re: Phenidone in Pyrocat-HD
>>>Date: Fri, 04 Mar 2005 09:12:13 -0500
>>>
>>>Delphine,
>>>
>>>The first Pyrocat-HD formula used metol as the synergism agent, but when
>>>I experimented with phenidone I found that it gave slightly greater
>>>effective film speed and somewhat finer grain. The difference is very
>>>small and many people who mix their own Pyrocat still use metol. The
>>>substitution of metol gives, based on my own experience, a slight
>>>increase in acutance, assuming the same type of agitation, but at the
>>>expense of EFS and grain.
>>>
>>>Sandy
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>>Sandy,
>>>>
>>>>First I would like to thank you for your answer.
>>>>I have another question about Pyrocat-HD. In fact I would like to know
>>>>why did you choose Phenidone for second developping agent and not
>>>>another? Is it in relation with its property to give low contrast?
>>>>
>>>>Thanks again.
>>>>
>>>>Delphine Chapuis
>>>>
>>>>>From: Sandy King <sanking@CLEMSON.EDU>
>>>>>Reply-To: alt-photo-process-l@sask.usask.ca
>>>>>To: alt-photo-process-l@sask.usask.ca
>>>>>Subject: Pyrocat-HD Developing times
>>>>>Date: Thu, 17 Feb 2005 11:09:14 -0500
>>>>>
>>>>>Hi Delphine,
>>>>>
>>>>>You can find Pyrocat-HD developing times for several films, including
>>>>>FP4+ and BPF 200, at the end of the article "An Introduction to Pyro
>>>>>Staining Developers, at
>>>>>http://unblinkingeye.com/Articles/PCat/pcat.html
>>>>>
>>>>>This article was translated into French as "Introduction aux
>>>>>révélateurs colorants au pyro" and is in the French language site
>>>>>Galerie-Photo, at
>>>>>http://www.galerie-photo.com/revelateurs-colorants-au-pyro.html.
>>>>>
>>>>>That data for FP4+ is very sound and his been consistent with several
>>>>>different testings of different emulsions. I can not say the same about
>>>>>BPF 200, however, as my testing has given some rather wide variations
>>>>>in results with different emulsions of this film.
>>>>>
>>>>>Let me know if you have any questions.
>>>>>
>>>>>Sandy
>>>>>
>>>>>
>>>>>>Sandy,
>>>>>>
>>>>>>I'm developping my film for a palladium process (Mike Ware's) but in
>>>>>>fact I just need standard (universal) developping times. I explain me:
>>>>>>I am a student at the Ecole Nationale Supérieure Louis Lumière
>>>>>>(France) in photography and I want to study the effect of the stain
>>>>>>with these films on a multigrade process. In fact my aim is to make
>>>>>>dual purpose negatives but to assign the development in priority to
>>>>>>the palladium process.
>>>>>>I will have to test pushing and pulling development and that's why I
>>>>>>only need standard times (to satisfy ISO Conditions, gamma = 0.8).
>>>>>>I hope my english is understandable!
>>>>>>
>>>>>>Thanks for your answer
>>>>>>
>>>>>>Delphine
>>>>>>
>>>>>>>From: Sandy King <sanking@CLEMSON.EDU>
>>>>>>>Reply-To: alt-photo-process-l@sask.usask.ca
>>>>>>>To: alt-photo-process-l@sask.usask.ca
>>>>>>>Subject: Re: Developping times
>>>>>>>Date: Thu, 17 Feb 2005 08:24:58 -0500
>>>>>>>
>>>>>>>For what process are you developing your film?
>>>>>>>
>>>>>>>Sandy King
>>>>>>>
>>>>>>>>Hi,
>>>>>>>>
>>>>>>>>Does anyone can recommend developping times for Bergger BPF 200 and
>>>>>>>>Ilford FP-4+ in Pyrocat-HD (Photographers Formulary formula)?
>>>>>>>>Thanks a lot
>>>>>>>>
>>>>>>>>Delphine Chapuis
>
Received on Fri Mar 4 09:23:15 2005

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