Re: Phenidone in Pyrocat-HD

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
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>>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 08:24:14 2005