Add group to favorites
Back to post list
Send new message to group Search:
Post Subject:
Adjusting development for temperature
Adjusting development for temperature
Given that the basement is still coolish from the winter, what would
be the best development time factor for D76 at 60 deg F (15 deg C)?
An experiment with a roll of film at 1.66x recommended time yielded a
rather razor thin negative, though the film had been sitting in the
camera a year or so. This time factor was taken from an old Manual of
Photography by Focal Press, but it was not specific to D76, just part
of a table of suggested factors at a given "temperature coefficient".
The Manual refers to temperature coefficient for developing agents and
listed a table of factors for a coefficient of 2.75. Here is a part of
the table:
Temp: Factor
15 deg C: 1.66
17 deg C: 1.35
20 deg C: 1.00
22 deg C: 0.82
I am just getting back into B&W film again, after a long hiatus. Any
comments on an appropriate development time for the next roll?
Some further searching on Google found the following link with some
more details:
"A characteristic, named the "temperature coefficient," has been used
as the quantitative measure of the change of activity. This is defined
as the ratio of
the development times required to produce equal density at two
temperatures differing
by 10°C., which is, of course, a difference of 18°F. The values
obtained range from 1.3 for metol alone, through 1.9 for pyro and
metol-hydroquinone combinations, to 2.5 for glycine."
from: http :// www .questia,com /PM.qst?a=o&d=97634617
(in referernce to the book: Handbook of Photography by Keith Henney,
Beverly Dudley; Whittlesey House, 1939.)
Thanks for any comments.
Given that the basement is still coolish from the winter, what would
be the best development time factor for D76 at 60 deg F (15 deg C)?
An experiment with a roll of film at 1.66x recommended time yielded a
rather razor thin negative, though the film had been sitting in the
camera a year or so. This time factor was taken from an old Manual of
Photography by Focal Press, but it was not specific to D76, just part
of a table of suggested factors at a given "temperature coefficient".
The Manual refers to temperature coefficient for developing agents and
listed a table of factors for a coefficient of 2.75. Here is a part of
the table:
Temp: Factor
15 deg C: 1.66
17 deg C: 1.35
20 deg C: 1.00
22 deg C: 0.82
I am just getting back into B&W film again, after a long hiatus. Any
comments on an appropriate development time for the next roll?
Some further searching on Google found the following link with some
more details:
"A characteristic, named the "temperature coefficient," has been used
as the quantitative measure of the change of activity. This is defined
as the ratio of
the development times required to produce equal density at two
temperatures differing
by 10°C., which is, of course, a difference of 18°F. The values
obtained range from 1.3 for metol alone, through 1.9 for pyro and
metol-hydroquinone combinations, to 2.5 for glycine."
from: http :// www .questia,com /PM.qst?a=o&d=97634617
(in referernce to the book: Handbook of Photography by Keith Henney,
Beverly Dudley; Whittlesey House, 1939.)
Thanks for any comments.
Re: Adjusting development for temperature
On Sun, 6 Apr 2008 12:46:05 -0700 (PDT),
sometime.photographer@gmail,com wrote:
[---]
>I am just getting back into B&W film again, after a long hiatus. Any
>comments on an appropriate development time for the next roll?
Check the times for the specific film you're using at:
< http :// www .digitaltruth,com /devchart.html>
and then compensate for the actual temperature of your basement, using
their time/temperature chart:
< http :// www .digitaltruth,com /images/time.gif>
On Sun, 6 Apr 2008 12:46:05 -0700 (PDT),
sometime.photographer@gmail,com wrote:
[---]
>I am just getting back into B&W film again, after a long hiatus. Any
>comments on an appropriate development time for the next roll?
Check the times for the specific film you're using at:
< http :// www .digitaltruth,com /devchart.html>
and then compensate for the actual temperature of your basement, using
their time/temperature chart:
< http :// www .digitaltruth,com /images/time.gif>
Re: Adjusting development for temperature
"Andrew Price" <ajprice@free,fr > wrote in message
news:81div35rhjs0vg2hm6imqkgb3r03di74ii@4ax,com ...
> On Sun, 6 Apr 2008 12:46:05 -0700 (PDT),
> sometime.photographer@gmail,com wrote:
>>I am just getting back into B&W film again, after a long hiatus. Any
>>comments on an appropriate development time for the next roll?
>
> Check the times for the specific film you're using at:
>
> < http :// www .digitaltruth,com /devchart.html>
>
> and then compensate for the actual temperature of your basement, using
> their time/temperature chart:
>
> < http :// www .digitaltruth,com /images/time.gif>
And keep your fingers crossed and hope by chance the chart is right. Many of
them are just straight-line extrapolations and that is not how all chemistry
works. Some of their film development specs are flat out guesses, some upon
a recommendation of a quesitonable source. One of those sources is a
hairbrained maniac who frequented this place and hasn't developed a roll of
film for forty years. Pure impressionism.
"Andrew Price" <ajprice@free,fr > wrote in message
news:81div35rhjs0vg2hm6imqkgb3r03di74ii@4ax,com ...
> On Sun, 6 Apr 2008 12:46:05 -0700 (PDT),
> sometime.photographer@gmail,com wrote:
>>I am just getting back into B&W film again, after a long hiatus. Any
>>comments on an appropriate development time for the next roll?
>
> Check the times for the specific film you're using at:
>
> < http :// www .digitaltruth,com /devchart.html>
>
> and then compensate for the actual temperature of your basement, using
> their time/temperature chart:
>
> < http :// www .digitaltruth,com /images/time.gif>
And keep your fingers crossed and hope by chance the chart is right. Many of
them are just straight-line extrapolations and that is not how all chemistry
works. Some of their film development specs are flat out guesses, some upon
a recommendation of a quesitonable source. One of those sources is a
hairbrained maniac who frequented this place and hasn't developed a roll of
film for forty years. Pure impressionism.
Re: Adjusting development for temperature
On Sun, 6 Apr 2008 18:26:09 -0500, <Pico> wrote:
>> and then compensate for the actual temperature of your basement, using
>> their time/temperature chart:
>>
>> < http :// www .digitaltruth,com /images/time.gif>
>
>And keep your fingers crossed and hope by chance the chart is right.
It's a starting point, nothing more. Most people who are seriously
interested in developing their own film take notes and compare the
results at different temperatures and dilutions.
>Many of
>them are just straight-line extrapolations and that is not how all chemistry
>works.
But over the short temperature range quoted (+14 to +24) it is a
starting point, and one recommended by Ilford and other manufacturers
of black and white film.
>Some of their film development specs are flat out guesses,
Hmm... supporting data?
>some upon
>a recommendation of a quesitonable source.
Do you have any convincing supporting evidence of that assertion?
>One of those sources is a
>hairbrained maniac who frequented this place and hasn't developed a roll of
>film for forty years.
Being more specific would add credulity to that statement.
>Pure impressionism.
Indeed - but whose?
On Sun, 6 Apr 2008 18:26:09 -0500, <Pico> wrote:
>> and then compensate for the actual temperature of your basement, using
>> their time/temperature chart:
>>
>> < http :// www .digitaltruth,com /images/time.gif>
>
>And keep your fingers crossed and hope by chance the chart is right.
It's a starting point, nothing more. Most people who are seriously
interested in developing their own film take notes and compare the
results at different temperatures and dilutions.
>Many of
>them are just straight-line extrapolations and that is not how all chemistry
>works.
But over the short temperature range quoted (+14 to +24) it is a
starting point, and one recommended by Ilford and other manufacturers
of black and white film.
>Some of their film development specs are flat out guesses,
Hmm... supporting data?
>some upon
>a recommendation of a quesitonable source.
Do you have any convincing supporting evidence of that assertion?
>One of those sources is a
>hairbrained maniac who frequented this place and hasn't developed a roll of
>film for forty years.
Being more specific would add credulity to that statement.
>Pure impressionism.
Indeed - but whose?
Re: Adjusting development for temperature
"Andrew Price" <ajprice@free,fr > wrote in message
news:netkv39v96aeiapvvfr94fchk837nn5cvt@4ax,com ...
> On Sun, 6 Apr 2008 18:26:09 -0500, <Pico> wrote:
>
>>> and then compensate for the actual temperature of your basement, using
>>> their time/temperature chart:
>>>
>>> < http :// www .digitaltruth,com /images/time.gif>
>>
>>And keep your fingers crossed and hope by chance the chart is right.
>
> It's a starting point, nothing more. Most people who are seriously
> interested in developing their own film take notes and compare the
> results at different temperatures and dilutions.
It may be a stopping point. If the full chemistry isn't active at 60F,
nothing might happen.
> But over the short temperature range quoted (+14 to +24) it is a
> starting point, and one recommended by Ilford and other manufacturers
> of black and white film.
Bullshit. Those are the recommended ranges, bottom and top, not higher and
not lower than that range.
>>Some of their film development specs are flat out guesses,
>
> Hmm... supporting data?
>
>>some upon
>>a recommendation of a quesitonable source.
>
> Do you have any convincing supporting evidence of that assertion?
I would, but I forgot the guy's name. Spanky or something like Uranium
Committee. Yep, that's a pseudo he used. Search for 'dougnut boy', his
lifelong masterpiece done in high school fifty years ago.
>>One of those sources is a
>>hairbrained maniac who frequented this place and hasn't developed a roll
>>of
>>film for forty years.
>
> Being more specific would add credulity to that statement.
I wrote that I would if I could recall his name, but some things are worth
forgetting. I don't know how long you have been around, and I don't want to
bother looking, but you might remember if you ... wait, It is Michael
something.
>>Pure impressionism.
>
> Indeed - but whose?
Michael S (spook, spoor, smegma, something)
"Andrew Price" <ajprice@free,fr > wrote in message
news:netkv39v96aeiapvvfr94fchk837nn5cvt@4ax,com ...
> On Sun, 6 Apr 2008 18:26:09 -0500, <Pico> wrote:
>
>>> and then compensate for the actual temperature of your basement, using
>>> their time/temperature chart:
>>>
>>> < http :// www .digitaltruth,com /images/time.gif>
>>
>>And keep your fingers crossed and hope by chance the chart is right.
>
> It's a starting point, nothing more. Most people who are seriously
> interested in developing their own film take notes and compare the
> results at different temperatures and dilutions.
It may be a stopping point. If the full chemistry isn't active at 60F,
nothing might happen.
> But over the short temperature range quoted (+14 to +24) it is a
> starting point, and one recommended by Ilford and other manufacturers
> of black and white film.
Bullshit. Those are the recommended ranges, bottom and top, not higher and
not lower than that range.
>>Some of their film development specs are flat out guesses,
>
> Hmm... supporting data?
>
>>some upon
>>a recommendation of a quesitonable source.
>
> Do you have any convincing supporting evidence of that assertion?
I would, but I forgot the guy's name. Spanky or something like Uranium
Committee. Yep, that's a pseudo he used. Search for 'dougnut boy', his
lifelong masterpiece done in high school fifty years ago.
>>One of those sources is a
>>hairbrained maniac who frequented this place and hasn't developed a roll
>>of
>>film for forty years.
>
> Being more specific would add credulity to that statement.
I wrote that I would if I could recall his name, but some things are worth
forgetting. I don't know how long you have been around, and I don't want to
bother looking, but you might remember if you ... wait, It is Michael
something.
>>Pure impressionism.
>
> Indeed - but whose?
Michael S (spook, spoor, smegma, something)
Re: Adjusting development for temperature
On 4/7/2008 5:43 PM jjs spake thus:
> "Andrew Price" <ajprice@free,fr > wrote in message
> news:netkv39v96aeiapvvfr94fchk837nn5cvt@4ax,com ...
>
>> Do you have any convincing supporting evidence of that assertion?
>
> I would, but I forgot the guy's name. Spanky or something like Uranium
> Committee. Yep, that's a pseudo he used. Search for 'dougnut boy', his
> lifelong masterpiece done in high school fifty years ago.
Close; you're talking about (dare I invoke his name here, lest he come
back to torment us?) Michael Scarpitti, aka "Uranium Committee" aka
"Waffle Boy".
--
The best argument against democracy is a five-minute
conversation with the average voter.
- Attributed to Winston Churchill
On 4/7/2008 5:43 PM jjs spake thus:
> "Andrew Price" <ajprice@free,fr > wrote in message
> news:netkv39v96aeiapvvfr94fchk837nn5cvt@4ax,com ...
>
>> Do you have any convincing supporting evidence of that assertion?
>
> I would, but I forgot the guy's name. Spanky or something like Uranium
> Committee. Yep, that's a pseudo he used. Search for 'dougnut boy', his
> lifelong masterpiece done in high school fifty years ago.
Close; you're talking about (dare I invoke his name here, lest he come
back to torment us?) Michael Scarpitti, aka "Uranium Committee" aka
"Waffle Boy".
--
The best argument against democracy is a five-minute
conversation with the average voter.
- Attributed to Winston Churchill
Re: Adjusting development for temperature
"David Nebenzahl" <nobody@but.us.chickens> wrote in message
news:47facb23$0$19853$822641b3@news.adtechcomputers,com ...
> Close; you're talking about (dare I invoke his name here, lest he come
> back to torment us?) Michael Scarpitti, aka "Uranium Committee" aka
> "Waffle Boy".
Yeah, that's the name! He's the guy who claims that Agfa Brovira was overly
contrasty and he could never get a good print. (Its grades were about one
lower than Kodak, back when they both made graded paper, and Agfa went from
0 to 6.) He also claimed that the Leica was the best camera in the world,
and the Fuckamat enlarging lenses were the very best, and that photography
could not possibly be an art. Didn't he rename his masterpiece to Doughnut
Boy? Or is that his new moniker?
Anyway, he claimed to be an authority on B&W film development and his
recommendation(s) were in Digital Truth. Be suspicious of ANYTHING that says
it is the truth.
Anyway, OP, so develop some Tri-X 125 in 60F or colder water and let us know
how it goes for you. Or don't. I would choose a more active developer for
cold water, something recommended for such an application. But WTF do I
know? I just started taking picture and making wet prints FIFTY years ago.
My next post will be more to the point of the post. Cold development
solutions (no pun).
"David Nebenzahl" <nobody@but.us.chickens> wrote in message
news:47facb23$0$19853$822641b3@news.adtechcomputers,com ...
> Close; you're talking about (dare I invoke his name here, lest he come
> back to torment us?) Michael Scarpitti, aka "Uranium Committee" aka
> "Waffle Boy".
Yeah, that's the name! He's the guy who claims that Agfa Brovira was overly
contrasty and he could never get a good print. (Its grades were about one
lower than Kodak, back when they both made graded paper, and Agfa went from
0 to 6.) He also claimed that the Leica was the best camera in the world,
and the Fuckamat enlarging lenses were the very best, and that photography
could not possibly be an art. Didn't he rename his masterpiece to Doughnut
Boy? Or is that his new moniker?
Anyway, he claimed to be an authority on B&W film development and his
recommendation(s) were in Digital Truth. Be suspicious of ANYTHING that says
it is the truth.
Anyway, OP, so develop some Tri-X 125 in 60F or colder water and let us know
how it goes for you. Or don't. I would choose a more active developer for
cold water, something recommended for such an application. But WTF do I
know? I just started taking picture and making wet prints FIFTY years ago.
My next post will be more to the point of the post. Cold development
solutions (no pun).
Re: Adjusting development for temperature
OK, I don't have the reference book for cold weather processing on-hand. It
must be in storage. Leitz had good information in one of their earlier
books. I might find it this weekend.
In the meantime, an *authoritative source mentions the rule of thumb
mentioned earlier - quoting from the book, "a general rule of thumb for the
range of 65 to 95F is that a decrease of 10F increases the development time
1.5 times." and they mention that the rule of thumb is just that - am
approximation.
Note that they do not include temperatures below 65F because lower
temperature solutions have more profound differences; they are not covered
by the rule of thumb.
* source: SPSE Handbook of Photographic Science and Engineering
1,416 pages
OK, I don't have the reference book for cold weather processing on-hand. It
must be in storage. Leitz had good information in one of their earlier
books. I might find it this weekend.
In the meantime, an *authoritative source mentions the rule of thumb
mentioned earlier - quoting from the book, "a general rule of thumb for the
range of 65 to 95F is that a decrease of 10F increases the development time
1.5 times." and they mention that the rule of thumb is just that - am
approximation.
Note that they do not include temperatures below 65F because lower
temperature solutions have more profound differences; they are not covered
by the rule of thumb.
* source: SPSE Handbook of Photographic Science and Engineering
1,416 pages
Re: Adjusting development for temperature
"jjs" <nobody@nowhere,net > wrote
> "a general rule of thumb for the range of 65 to 95F is that a decrease of
> 10F increases the development time 1.5 times."
Leading back to first-year chemistry ...
http :// en.wikipedia.org/wiki/Arrhenius_equation
where the rate of a reaction doubles every 10C.
A variation on the universal equation:
Something = Something Else * e ^ -(Energy of the thing / k * T)
Where k is Boltzman's constant and T is temperature
relative to absolute zero.
--
Nicholas O. Lindan, Cleveland, Ohio
Darkroom Automation: F-Stop Timers, Enlarging Meters
http :// www .darkroomautomation,com /index2.htm
n o lindan at ix dot netcom dot com
"jjs" <nobody@nowhere,net > wrote
> "a general rule of thumb for the range of 65 to 95F is that a decrease of
> 10F increases the development time 1.5 times."
Leading back to first-year chemistry ...
http :// en.wikipedia.org/wiki/Arrhenius_equation
where the rate of a reaction doubles every 10C.
A variation on the universal equation:
Something = Something Else * e ^ -(Energy of the thing / k * T)
Where k is Boltzman's constant and T is temperature
relative to absolute zero.
--
Nicholas O. Lindan, Cleveland, Ohio
Darkroom Automation: F-Stop Timers, Enlarging Meters
http :// www .darkroomautomation,com /index2.htm
n o lindan at ix dot netcom dot com
Re: Adjusting development for temperature
In article <XoSdnQKuG-lv52banZ2dnUVZ_v6rnZ2d@earthlink,com >,
Nicholas O. Lindan <see@sig,com > wrote:
>"jjs" <nobody@nowhere,net > wrote
>
>> "a general rule of thumb for the range of 65 to 95F is that a decrease of
>> 10F increases the development time 1.5 times."
>
>Leading back to first-year chemistry ...
> http :// en.wikipedia.org/wiki/Arrhenius_equation
>where the rate of a reaction doubles every 10C.
>
>A variation on the universal equation:
>
> Something = Something Else * e ^ -(Energy of the thing / k * T)
>
>Where k is Boltzman's constant and T is temperature
>relative to absolute zero.
Unfortunately, there are several reactions going on at once in a typical
photographic development bath. For example, consider a tank full of D76:
the primary development agent (the metol) is being exhausted by developing
the film, and regenerated by stealing electrons from the other developing
agents. A buffer reaction is keeping the pH of the solution stable, at
the same time. More complex developers will have sequestering agents
grabbing up development-inhibiting reaction products and holding them in
solution, etc. -- and all these reactions have different energies, thus
proceed at different rates. Get below or above some threshold temperature,
and the overall reaction won't run as designed, period, and the
characteristic curve of the resulting negatives will be...different.
In any event, if you actually fit curves to the time/temperature data for
common films and developers (at some constant exposure and density) you
will find that they are, at least, shallow 2nd-order curves -- not linear.
And that's within a fairly narrow temperature range, all bets are off once
you get outside there. The film/developer testing page on Paul Butzi's
site has some nice examples of the data and the curves that fit it, and
they are *not* straight lines.
--
Thor Lancelot Simon tls@rek.tjls,com
"The inconsistency is startling, though admittedly, if consistency is to
be abandoned or transcended, there is no problem." - Noam Chomsky
In article <XoSdnQKuG-lv52banZ2dnUVZ_v6rnZ2d@earthlink,com >,
Nicholas O. Lindan <see@sig,com > wrote:
>"jjs" <nobody@nowhere,net > wrote
>
>> "a general rule of thumb for the range of 65 to 95F is that a decrease of
>> 10F increases the development time 1.5 times."
>
>Leading back to first-year chemistry ...
> http :// en.wikipedia.org/wiki/Arrhenius_equation
>where the rate of a reaction doubles every 10C.
>
>A variation on the universal equation:
>
> Something = Something Else * e ^ -(Energy of the thing / k * T)
>
>Where k is Boltzman's constant and T is temperature
>relative to absolute zero.
Unfortunately, there are several reactions going on at once in a typical
photographic development bath. For example, consider a tank full of D76:
the primary development agent (the metol) is being exhausted by developing
the film, and regenerated by stealing electrons from the other developing
agents. A buffer reaction is keeping the pH of the solution stable, at
the same time. More complex developers will have sequestering agents
grabbing up development-inhibiting reaction products and holding them in
solution, etc. -- and all these reactions have different energies, thus
proceed at different rates. Get below or above some threshold temperature,
and the overall reaction won't run as designed, period, and the
characteristic curve of the resulting negatives will be...different.
In any event, if you actually fit curves to the time/temperature data for
common films and developers (at some constant exposure and density) you
will find that they are, at least, shallow 2nd-order curves -- not linear.
And that's within a fairly narrow temperature range, all bets are off once
you get outside there. The film/developer testing page on Paul Butzi's
site has some nice examples of the data and the curves that fit it, and
they are *not* straight lines.
--
Thor Lancelot Simon tls@rek.tjls,com
"The inconsistency is startling, though admittedly, if consistency is to
be abandoned or transcended, there is no problem." - Noam Chomsky
Re: Adjusting development for temperature
"Nicholas O. Lindan" <see@sig,com > wrote in message
news:XoSdnQKuG-lv52banZ2dnUVZ_v6rnZ2d@earthlink,com ...
> "jjs" <nobody@nowhere,net > wrote
>
>> "a general rule of thumb for the range of 65 to 95F is that a decrease of
>> 10F increases the development time 1.5 times."
>
> Leading back to first-year chemistry ...
> http :// en.wikipedia.org/wiki/Arrhenius_equation
> where the rate of a reaction doubles every 10C.
Perhaps for quite similar chemicals separately, but our developers are
complex mixes.
"Nicholas O. Lindan" <see@sig,com > wrote in message
news:XoSdnQKuG-lv52banZ2dnUVZ_v6rnZ2d@earthlink,com ...
> "jjs" <nobody@nowhere,net > wrote
>
>> "a general rule of thumb for the range of 65 to 95F is that a decrease of
>> 10F increases the development time 1.5 times."
>
> Leading back to first-year chemistry ...
> http :// en.wikipedia.org/wiki/Arrhenius_equation
> where the rate of a reaction doubles every 10C.
Perhaps for quite similar chemicals separately, but our developers are
complex mixes.
Re: Adjusting development for temperature
On Apr 7, 11:04 pm, "jjs" <nob...@nowhere,net > wrote:
> ...
> Anyway, OP, so develop some Tri-X 125 in 60F or colder water and let us know
> how it goes for you. Or don't. I would choose a more active developer for
> cold water, something recommended for such an application. But WTF do I
> know? I just started taking picture and making wet prints FIFTY years ago.
>
> My next post will be more to the point of the post. Cold development
> solutions (no pun).
Hi, JJS. Did you have any recommendations for cold water processing?
A check of the Manual I have shows no specific cold water
formulations. However, it did list a tropical developer that can be
used to 32 deg C, useful for when summer comes.
On Apr 7, 11:04 pm, "jjs" <nob...@nowhere,net > wrote:
> ...
> Anyway, OP, so develop some Tri-X 125 in 60F or colder water and let us know
> how it goes for you. Or don't. I would choose a more active developer for
> cold water, something recommended for such an application. But WTF do I
> know? I just started taking picture and making wet prints FIFTY years ago.
>
> My next post will be more to the point of the post. Cold development
> solutions (no pun).
Hi, JJS. Did you have any recommendations for cold water processing?
A check of the Manual I have shows no specific cold water
formulations. However, it did list a tropical developer that can be
used to 32 deg C, useful for when summer comes.
Re: Adjusting development for temperature
<sometime.photographer@gmail,com > wrote in message
news:65b348fd-1314-4287-a185-
>Hi, JJS. Did you have any recommendations for cold water processing?
>A check of the Manual I have shows no specific cold water
>formulations. However, it did list a tropical developer that can be
>used to 32 deg C, useful for when summer comes.
Same here. My SPSE manual has tropical processing but nothing useful for
cold. This afternoon I am going to the shop to work on the 8x10" enlarger,
and I have a couple of boxes of books. I will try to find the cold-temp
processing article I read years ago. If I find it I will post pertinent
info.
<sometime.photographer@gmail,com > wrote in message
news:65b348fd-1314-4287-a185-
>Hi, JJS. Did you have any recommendations for cold water processing?
>A check of the Manual I have shows no specific cold water
>formulations. However, it did list a tropical developer that can be
>used to 32 deg C, useful for when summer comes.
Same here. My SPSE manual has tropical processing but nothing useful for
cold. This afternoon I am going to the shop to work on the 8x10" enlarger,
and I have a couple of boxes of books. I will try to find the cold-temp
processing article I read years ago. If I find it I will post pertinent
info.
Re: Adjusting development for temperature
"John" <john@stafford,net > wrote
> Same here. My SPSE manual has tropical processing but nothing useful for
> cold.
Low temperature film development, from the "Photo-Lab Index" 1983.
http :// www .nolindan,com /UsenetStuff/Low%20Temperature%20Developing001.pdf
http :// www .nolindan,com /UsenetStuff/Low%20Temperature%20Developing002.pdf
TTBOMK, the Photo-Lab index has been out of print since '94 though
many are available from Abe's Books etc.
--
Nicholas O. Lindan, Cleveland, Ohio
Darkroom Automation: F-Stop Timers, Enlarging Meters
http :// www .darkroomautomation,com /index2.htm
n o lindan at ix dot netcom dot com
"John" <john@stafford,net > wrote
> Same here. My SPSE manual has tropical processing but nothing useful for
> cold.
Low temperature film development, from the "Photo-Lab Index" 1983.
http :// www .nolindan,com /UsenetStuff/Low%20Temperature%20Developing001.pdf
http :// www .nolindan,com /UsenetStuff/Low%20Temperature%20Developing002.pdf
TTBOMK, the Photo-Lab index has been out of print since '94 though
many are available from Abe's Books etc.
--
Nicholas O. Lindan, Cleveland, Ohio
Darkroom Automation: F-Stop Timers, Enlarging Meters
http :// www .darkroomautomation,com /index2.htm
n o lindan at ix dot netcom dot com
Re: Adjusting development for temperature
"Nicholas O. Lindan" <see@sig,com > wrote in message
news:3O-dnap18rAhlZzVnZ2dnUVZ_jednZ2d@earthlink,com ...
> Low temperature film development, from the "Photo-Lab Index" 1983.
>
> http :// www .nolindan,com /UsenetStuff/Low%20Temperature%20Developing001.pdf
> http :// www .nolindan,com /UsenetStuff/Low%20Temperature%20Developing002.pdf
Thanks for coming through, Nicholas!
That D8 developer is some powerful stuff!
"Nicholas O. Lindan" <see@sig,com > wrote in message
news:3O-dnap18rAhlZzVnZ2dnUVZ_jednZ2d@earthlink,com ...
> Low temperature film development, from the "Photo-Lab Index" 1983.
>
> http :// www .nolindan,com /UsenetStuff/Low%20Temperature%20Developing001.pdf
> http :// www .nolindan,com /UsenetStuff/Low%20Temperature%20Developing002.pdf
Thanks for coming through, Nicholas!
That D8 developer is some powerful stuff!
