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MQ and PQ developers.

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Stephen Furley

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Jun 9, 2002, 10:46:46 AM6/9/02
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What are the relative advantages and disadvantages of metol and
phenidone in otherwise similar developers?

Robert Feinman

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Jun 9, 2002, 11:15:43 AM6/9/02
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Phenidone give slightly higher effective film speed. You need less of
the agent (about 10%) but it costs a lot more. Mixed stock solutions
keep slightly less well.
The workhorse version is Ilford's Microphen.
Some people claim it has coarser grain.
Myself, after years of fussing, I use D76 for everything.

Stephen Furley wrote:
> What are the relative advantages and disadvantages of metol and
> phenidone in otherwise similar developers?


--
Robert D Feinman
robertd...@netscape.net
Landscapes, Cityscapes, Panoramic Photographs: http://robertdfeinman.com

Mike

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Jun 9, 2002, 12:30:03 PM6/9/02
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Phenidone is a little more user fiiendly/toxic compared to Metol. Some
people can develop skin reactions to Metol and not Phenidone.

Phenidone is used in much smaller quantities than metol and for many
formula best made up as a percentage solution. While gram for gram
Phenidone costs more it is more economical than Metol because you use
such a small amount.

Mike

On 9 Jun 2002 07:46:46 -0700, fur...@mail.croydon.ac.uk (Stephen

Rick Schiller

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Jun 9, 2002, 12:58:33 PM6/9/02
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Amen, Reverend D76. You are preaching to the Choir.

In article <3D03711F...@netscape.net>, robertd...@netscape.net
says...

Dan Quinn

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Jun 9, 2002, 6:42:29 PM6/9/02
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fur...@mail.croydon.ac.uk (Stephen Furley)

Similar is correct. Patrick Dignan's Classic B&W Formulas, covers a
lot of ground and includes, as well, perhaps two dozen or more formulas.
Although I could not find the page, Mr. Dignan believes that phenidone
does impart a true boost in film speed.
His own ONE SHOT and Divided types are included. Keeping properties
of the chemical and it's stock solutions are a problem. That from other
sources as well. I do homebrew and do have 10gr on hand. It is used in
minute amounts. Try ascorbic acid. Dan

John

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Jun 10, 2002, 12:45:36 AM6/10/02
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Posted and mailed.

FWIW, I was quite surprised to find that Microphen keeps quite well.
I had mixed some about 2 years ago and bottled it into HDPE bottles. Came
across one while looking for something and as it looked OK, I developed a
roll of film with it. It worked like brand new stock.

Regards,

John S. Douglas - Photographer, Webmaster & Computer Tech
Website --- http://www.darkroompro.net

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