[pure-silver] Re: Old Paper Results
- From: DarkroomMagic <info@xxxxxxxxxxxxxxxx>
- To: PureSilverNew <pure-silver@xxxxxxxxxxxxx>
- Date: Thu, 06 Oct 2005 20:30:00 +0200
Dave
Good point, actually. I have always measured the delta between Dmin and Dmax
to determine paper contrast. I know Dmin goes up but don't know if Dmax
comes down with age.
Regards
Ralph W. Lambrecht
http://www.darkroomagic.com
On 2005-10-06 18:50, "Dave Valvo" <dvalvo@xxxxxxxxxxxxxxxx> wrote:
> Ralph,
>
> Here's a list of other things to look at with age:
>
> Dmin increase silver fog vs yellowing of gel
> Tint
> mottle in gray areas
> brittleness
> speed loss
> white spots in gray areas
> black spots in white areas
>
> Dave
>
>
>
> ----- Original Message -----
> From: "DarkroomMagic" <info@xxxxxxxxxxxxxxxx>
> To: "PureSilverNew" <pure-silver@xxxxxxxxxxxxx>
> Sent: Thursday, October 06, 2005 11:17 AM
> Subject: [pure-silver] Re: Old Paper Results
>
>
>> Richard
>>
>> Please explain. This note isn't as fact-filled as your typical notes.
>> These
>> test results sound rather vague. 'probably as good as new' and 'somewhat
>> soft looking', or even 'has full contrast' don't sound like a test results
>> but mere observations without measurable evidence.
>>
>> I did conduct a test to determine the effect of paper age on contrast a
>> few
>> years ago. These were made on a variety of papers, I had for up to ten
>> years
>> and they were stored at 5 degC. Their contrast was measured every two
>> years.
>> The study wasn't very scientific either, but it produced numerical values,
>> which were compared and found to be consistent. The result was as follows:
>>
>> 1. All papers get softer with age.
>> 2. Some papers are more stable than others
>> 3. The effect is significant an averages about 1/2 grade over 3 years.
>> 4. The effect can be compensated with filtration as long as max contrast
>> is
>> not required.
>>
>> I think it is fair to assume that paper stored at room temperature would
>> see
>> a higher loss of contrast in the same amount of time.
>>
>>
>>
>>
>>
>> Regards
>>
>>
>>
>> Ralph W. Lambrecht
>>
>> http://www.darkroomagic.com
>>
>>
>>
>>
>>
>>
>>
>> On 2005-10-04 06:15, "Richard Knoppow" <dickburk@xxxxxxxxxxxxx> wrote:
>>
>>> As a result of a question posted to rec.photo.darkroom I
>>> decided to dig out and test some very old paper I have. The
>>> samples were of Kodak Medalist and Agfa Brovira. None of the
>>> packages has an expiration date but I've had them for at
>>> least ten years and probably bought them as out dated paper
>>> then. All packates were opened years ago and have had no
>>> special storage.
>>> To make a long story short both boxes of Medalist and the
>>> Brovira work fine and probably look as good as they did new.
>>> Its possible the Medalist has lost some contrast but my
>>> memory of it is that it was a somewhat soft looking paper
>>> originally. The Brovira has full contrast. I have even more
>>> Agfa paper in storage and will have to get it out. About the
>>> only old Agfa paper I had trouble with came from a flooded
>>> basement and was blotchy, obviously moisture had gotten in.
>>> Otherwise the stuff seems to last forever.
>>> I have not had such good luck with old Kodak paper and
>>> stopped buying outdated paper about the time I got the
>>> Medalist. Mostly the bad paper was Polycontrast which had
>>> very low contrast for all filters, evidently, the high
>>> contrast emulsion component had lost substantial
>>> sensitivity. It made good drawing paper.
>>> I also found I have two unopened boxes of Oriental
>>> Seagull paper, also at least ten years old but bought new at
>>> the time. I have not tested this yet and will report when I
>>> do.
>>>
>>> Processing of the above was conventional. I used Agfa Neutol
>>> Plus, an ascorbic acid (and probably Phenidone) developer
>>> without any added anti-fog.
>>> I also used this occasion to test the Kodak Enlarging
>>> Ektar I picked up a couple of weeks ago. This is a 75mm
>>> lens. Its very sharp, as good as my Schneider Componon, not
>>> bad for $10 :-)
>>>
>>> ---
>>> Richard Knoppow
>>> Los Angeles, CA, USA
>>> dickburk@xxxxxxxxxxxxx
>>>
>>> ============================================================================
>>> ==
>>> ===============================
>>> To unsubscribe from this list, go to www.freelists.org and logon to your
>>> account (the same e-mail address and password you set-up when you
>>> subscribed,)
>>> and unsubscribe from there.
>>
>>
>> =============================================================================
>> ================================
>> To unsubscribe from this list, go to www.freelists.org and logon to your
>> account (the same e-mail address and password you set-up when you
>> subscribed,) and unsubscribe from there.
>>
>
>
> ==============================================================================
> ===============================
> To unsubscribe from this list, go to www.freelists.org and logon to your
> account (the same e-mail address and password you set-up when you subscribed,)
> and unsubscribe from there.
=============================================================================================================
To unsubscribe from this list, go to www.freelists.org and logon to your
account (the same e-mail address and password you set-up when you subscribed,)
and unsubscribe from there.
Other related posts:
