[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Pyro ABC+

Hi all,

Thanks for your input Harold and Carl. Here are the latest batch of numbers
and information.

I mixed fresh Pyro this morning with distilled water at room temperature
(66 degrees F) Making sure all the ingredients were dissolved into
solution. I prepared only 500ml of solution A. All went well no precipitate
forming. It should be noted that I did not have a precipitate form on the
original batch of ABC+ until several days after mixing, these original
solutions were stored in clean 125ml brown glass containers completely
filled with no air trapped, plastic caps and wrapped with parafilm to
ensure a air tight seal. This could be explained buy the solution
"ripening". I will have to see what will happens several days from now with
this batch that I have handled the exact same way. 

New tests were shot this afternoon and processed approximatively 6 hours
after mixing the fresh batch of ABC+ stock solution. The only inconsistency
is that I processed the film a bit warmer at temperature 73 degrees F. I
used the same dilution 1:2:75 in the Jobo Expert drum with the agitation
set at 4.  My results were not significantly different from the original
numbers, but you guys are the experts so let me know what you think.


All the density readings include film base fog. For each zone the first
number is at the densitometers neutral channel and the second is made using
the Yellow channel (blue).

No Exposure FB+F 	.14/.31
Zone 0			.23/.48
Zone I			.24/.51
Zone II		.36/.68
Zone III		.44/.84
Zone V			.75/.1.29
Zone VIII		1.45/2.25
Zone IX		1.66/2.55

I exposed a few sheets of film around the house and the negatives look
wonderful with good detail in the shadows and the highlights, reaching well
into Zone VIII+, holding detail. So what do you think? Bad batch of
Pyrogallol? Are my Temps too high? Too dilute a working solution? Is my
agitation to aggressive and maybe slowed down on the Jobo processor? Is my
ISO set too low for TXP?

Your input and time is much appreciated. It will be nice to get the film
processing aspect down and move onto some printing.

Thanks again for your help and input.

Marty



At 10:23 PM 4/29/01 +0200, you wrote:
>Martin,
>reading about your problems with the A solution of ABC+ and following your
>conversation with Carl I have to agree him that something seems to be wrong
>with your Pyrogallol. The A solution isn´t in such high concentration that
>precipitates will be formed at room temperature normally.
>Maybe your Pyrogallol is not in such quality we need ,it can have an unknown
>amount of by-products (5-20%) depends on its quality grade. This by-products
>may react in the  A solution and form the precipitate - and there must be
>some reactions in the A solution because it should be first used some days
>after mixing - I call this a ripening-process.
>You should call Phtographers Formulary for another sample of Pyro, tell them
>your problem.
>
>I use the ABC+ formula like 1+2+50 @72 degrees for 6,5 min (Tri-X with ISO
>320)
>
>maybe this settings can solve your problems, too.
>
>Greetings
>Harald
>
>Harald Leban
>hleban@telering.at
>Austria / E.U.
>
>
>-----Ursprüngliche Nachricht-----
>Von: "Martin Salowey" <mnspeebs@castle.net>
>An: <alt-photo-process-l@skyway.usask.ca>
>Gesendet: Samstag, 28. April 2001 23:15
>Betreff: Pyro ABC+
>
>
>> Hi All,
>>
>> I have been working on standardizing Tri-X sheet film processing times
>with
>> the ABC+ Leban Formula diluted 1:2:75 @72 degrees F in a Jobo Expert drum
>> with the rotation set at 4.
>>
>> I have a couple of questions to get me headed off in the right direction.
>>
>>
>> 1. Should fresh stock solution A after sitting a few days in a room at
>> about 68 degrees F form a precipitate? I went to process some film this
>> afternoon and was shocked to find my fresh stock, mixed less than a week
>> ago, has a fuzzy precipitate (looks kind of like pyro crystals). I am
>> assuming it is the pyro since the solution is rather saturated, but does
>> not seem to want to dissolve when gently heated in a bain marie. Anybody
>> else ever have this problem? The pyro was purchased in 1 lb. quantities
>> from Photographers Formulary.
>>
>> 2. I realize that densitometric evaluation is really only a point of
>> departure with pyro but would like to see if my results are heading in the
>> right direction. (Mr. Wesse are you out there?) The densities are for a
>> given exposure(zone) and read for both neutral and yellow (B) channels.
>> (Exposure Neutral/Yellow) These tests were processed in ABC+ 1:2:75 @ 72
>> degrees F for 8.5 minutes in the 4x5 Jobo expert drum at a rotation of 4.
>>
>>
>> 1. fb+f   .12/.27
>> 2. Zone 0 .24/.45
>> 3. Zone I .32/.58
>> 4. Zone III .45/.87
>> 5. Zone V .68/1.18
>> 6. Zone VIII 1.31/2.06
>>
>> Thank you in advance for your input.
>>
>> Marty
>
>
>
>