[alt-photo] re-acidification of fabriano

[Paul Viapiano]

As a sidebar to my last remarks (see below)...I tried reacidifying my 
Fabriano with a stronger solution (5% oxalic acid vs 1%) and let it soak for 
a longer period. Paper isbetter but still not hitting on all cylinders.

Has anyone ever had a batch of paper that they couldn't make work? I don't 
know what else I could do except more soaking.

Paul



----- Original Message ----- 
From: "Paul Viapiano" <viapiano at pacbell.net>
To: "The alternative photographic processes mailing list" 
<alt-photo-process-list at lists.altphotolist.org>
Sent: Wednesday, June 30, 2010 10:59 AM
Subject: [alt-photo] Re: pt/pd differences in exposure methods


> Thanks, Eric...
>
> I do keep detailed notes on everything.
>
> I worked out the problem this morning. It seems that my latest package of 
> Fabiano needs a lot more acidification than my last batch. I had one sheet 
> left from the old pile and just tested it. Perfect...all other variables 
> were exact.
>
> Much thanks...your reply should be in the pantheon of troubleshooting 
> lists.
>
> Paul
>
>
> ----- Original Message ----- 
> From: "EJ Photo" <ejnphoto at sbcglobal.net>
> To: "'The alternative photographic processes mailing list'" 
> <alt-photo-process-list at lists.altphotolist.org>
> Sent: Wednesday, June 30, 2010 10:48 AM
> Subject: [alt-photo] Re: pt/pd differences in exposure methods
>
>
>> Paul, Over the years there has been much discussion on different exposure
>> units, and everything under the sun. With not only the quality of light 
>> but
>> the quantity of light being important, they alone don't determine the 
>> speed
>> of the coated paper. The film or substrate that holds the resist, 
>> negative
>> both digital and traditional, blocks UV light as does the glass. it is a
>> complicated set of variables. The glass types can change their UV 
>> blocking
>> characteristics while keeping the same name or label. Rigorous testing 
>> over
>> all the possible sources has not to my knowledge been done with 
>> certainty.
>>
>> You also have the moisture content, and make up of FO, AFO, and paper 
>> types.
>>
>>
>> Mike Ware did put out a paper on platinum printing many years back that 
>> did
>> specify yield based on certain UV output. It did hold true to my
>> observations, but I never tried to match, make equivalent controls, etc.
>> Best advise I can offer on that is keep notes, and use your findings for
>> your specific set of contact frames, glass, negatives and ink sets.
>>
>> NuArc is a brand, but not a specific lamp; there are several that work.
>>
>> Eric Neilsen
>> Eric Neilsen Photography
>> 4101 Commerce Street, Suite 9
>> Dallas, TX 75226
>>
>> www.ericneilsenphotography.com
>> skype me with ejprinter
>> www.ericneilsenphotography.com/forum1
>> Let's Talk Photography
>>
>> -----Original Message-----
>> From: alt-photo-process-list-bounces at lists.altphotolist.org
>> [mailto:alt-photo-process-list-bounces at lists.altphotolist.org] On Behalf 
>> Of
>> Paul Viapiano
>> Sent: Tuesday, June 29, 2010 6:28 PM
>> To: The alternative photographic processes mailing list
>> Subject: [alt-photo] Re: pt/pd differences in exposure methods
>>
>> No, Jeremy, I don't.
>>
>>
>> ----- Original Message ----- 
>> From: "Jeremy Moore" <jeremydmoore at gmail.com>
>> To: "The alternative photographic processes mailing list"
>> <alt-photo-process-list at lists.altphotolist.org>
>> Sent: Tuesday, June 29, 2010 4:24 PM
>> Subject: [alt-photo] Re: pt/pd differences in exposure methods
>>
>>
>>> Paul, do you have a densitometer to measure the difference in reflective
>>> dMax?
>>>
>>> On Jun 29, 2010 5:44 PM, "Paul Viapiano" <viapiano at pacbell.net> wrote:
>>>
>>> Has anyone compared exposure methods and the differences in results?
>>>
>>> I seem to get deeper blacks when exposing in the sun than using the 
>>> NuArc.
>>> Even using a separate custom curve for each method, the sun gives me a
>>> better black, more contrasty result...
>>>
>>> Don't get me wrong, the results are very good, but the edge goes to the
>>> sun
>>> prints.
>>>
>>> Paul
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