From: clay (wcharmon@wt.net)
Date: 03/04/02-06:38:11 AM Z
Don:
FWIW, I use about 220-250 ml of working solution per 8x10 sheet and about
400 per 7x17. The staining is NOT as vividly yellow-green as the PMK and
Rollo stain, but Sandy is absolutely correct in its actinic filtering
effect. I get about .35-.45 additional effective printing density in
highlights that have B&W densitometer densities of 1.7-1.8. For whatever
reasons(water supply?), I am able to get much more consistent staining with
this developer that with Rollo.
BTW, if you are rotary processing big film in a Jobo, be sure and follow the
recommendations on the unblinkingeye.com site for agitation procedures. I
have found that they are absolutely essential to prevent bromide drag.
Clay
> From: Sandy King <sanking@clemson.edu>
> Reply-To: alt-photo-process-l@skyway.usask.ca
> Date: Sun, 03 Mar 2002 23:58:58 -0500
> To: alt-photo-process-l@skyway.usask.ca
> Subject: Re: Pyro-cat HD
>
> Hi Don,
>
> The Pyrocat stain is of a different color than that of PMK and ABC+
> and is not quite as intense. Visually you may not think of it as
> stain at first since the color is more neutral than what you get with
> PMK and ABC+. However, if you measure the highlights with a
> densitometer, first in B&W mode and then with the Blue channel, you
> will find that the Blue channel, which more closely approximates the
> actual printing density, reads quite a bit higher.
>
> That assumes that all is well with the chemistry/mixing, etc.
>
> However, processing does matter. If you develop a very small sheet of
> film in a large quantity of developer there will not be much stain
> because the formation of the stain depends to some extent on partial
> exhaustion of the developer, as is also the case with PMK and ABC+.
>
> Sandy King
>
>
>
>> Hi Folks,
>>
>> I finally had an opportunity to try Sandy King's Pyro-cat developer this
>> weekend with some test exposures of Tri-X Pro, 4x5 sheet film.
>>
>> Without iterating all of the processing details I was surprised to see that
>> there was very little stain. I was expecting something more overt. The
>> rebate was very clear and had no sign of staining.
>>
>> Should I have seen more color in the stain? I used the formula listed on Ed
>> Buffaloe's web site.
>>
>> Any comments?
>>
>> Thanks,
>> Don Bryant
>
>
> --
>
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