Rodinal

On Sun, 21 Mar 2004 21:55:51 +0100, Andrew Price
wrote:

On Sun, 21 Mar 2004 15:01:26 GMT,
(Gary Beasley) wrote:

In a thread elsewhere I read that a spray called Protectan to preserve
developers consists of propane and/or butane. So if you have a butane
refiller for cigarette lighters a quick squirt of that into the bottle
after use does work to prevent oxygen from getting to the developer.

It's true, it really does work. That being said, in my experience,
Rodinal doesn't need treatment with Protectan.

I agree with the others - it's one developer which seems to be
virtually indestructible, no matter how long the bottle has been open.

Actually I use nitrogen to displace the air, and I do see the
difference in the Rodinal bottle, it doesn't turn brown by the time
it's half empty like it did before I started using the nitrogen. For
color chemicals this can be a lifesaver (not the round kind with the
hole). ;-)

In my experience Rodinol lasts almost forever. After about six months it
turns a dark rusty red, but still has no change in its developing power that
I can see. I have used Rodinol well over a year old that worked as well as
new.

My standard film/developer combo is T-Max 100 developed for 11 minutes in
Rodinol 1-100 @ 75º for normal development.

Frank Rome, NY

Gary Beasley wrote:

On Sun, 21 Mar 2004 21:55:51 +0100, Andrew Price
wrote:

On Sun, 21 Mar 2004 15:01:26 GMT,
(Gary Beasley) wrote:

In a thread elsewhere I read that a spray called Protectan to preserve
developers consists of propane and/or butane. So if you have a butane
refiller for cigarette lighters a quick squirt of that into the bottle
after use does work to prevent oxygen from getting to the developer.

It's true, it really does work. That being said, in my experience,
Rodinal doesn't need treatment with Protectan.

I agree with the others - it's one developer which seems to be
virtually indestructible, no matter how long the bottle has been open.

Actually I use nitrogen to displace the air, and I do see the
difference in the Rodinal bottle, it doesn't turn brown by the time
it's half empty like it did before I started using the nitrogen. For
color chemicals this can be a lifesaver (not the round kind with the
hole). ;-)

(jjs) wrote in message news:
.....
Crap. I'm such a dummy. That's "all _but perhaps TMax films_ develop in
the same time at 1:100 for 50 minutes." I haven't tried TMax. I use Agfa
films.

Agfa used to publish a sheet of development data for many films (Agfa
and non-Agfa) developed for 15 and 20 min in Rodinal 1+100. For
15min, gamma ranged from 0.45 (HP5+, FP4+ and APX100) to 0.65 (Tri-X).
For 20min, gamma ranged from 0.50 to 0.68

For some films, there was minimal or no contrast increase from 15 to
20 min. Maybe there is practically no difference between 20 and 50
minutes. They recommended at least 250mL of developer for each film.
Maybe using more would lead to more contrast since developer
exhaustion is likely to be a limiting factor.

The table must have been prepared some time ago, as it listed Pan F
separately from PanF+, and Panatomic-X. It did however include later
films like the TMax and DElta films, so it probably included info from
different dates.

If you can't find it, can someone suggest where I could upload it to
so that people could have a look at it?

I found a bottle of Rodinal that my friend's father had in the attic. After
35 years it developed like heaven.

Moda

"Alparslan" skrev i en meddelelse
...
Hi all,

Rodinal is not available in Turkey. I believe it is because in part Agfa's
low profile marketing strategy. Anyway, I read a lot about Rodinal and
decided to try it. I bought some rodinal in the U.S and am ready to give
it
a shot. It is half a liter bottle of Rodinal. I was hoping that it has a
long shelf life like the T-Max developer I mainly use and bought the
larger
bottle. T-Max developer has a shelf life of 2 years in proper conditions.
As
I do not develop not more than 1-2 rolls of film in a week, shelf life is
important to me.

In the leaflet of rodinal, it says once the original bottle has been
opened,
the stock will keep for 6 months. I know Rodinal is very concentrated like
the T-Max and I am wondering if keeping the stock rodinal in air tight
brown
glass bottles (trying not to leave any air in the bottles by moving the
stock in smaller bottles as it is consumed) will help extend the life of
stock rodinal over 6 months.

I have another question. I use 300 ml of working solution to develop 35
mm.
films. the 1+50 dilution requires really little amounts of stock
developer.
Is there a threshold for the stock amount to be used, any minumum limits?

Thank you all for helping me. Kind regards,

Alparslan

"Alparslan" wrote in message news

In the leaflet of rodinal, it says once the original bottle has been opened,
the stock will keep for 6 months. I know Rodinal is very concentrated like
the T-Max and I am wondering if keeping the stock rodinal in air tight brown
glass bottles (trying not to leave any air in the bottles by moving the
stock in smaller bottles as it is consumed) will help extend the life of
stock rodinal over 6 months.

The 6 month limit is very conservative, even without moving into
smaller bottles.

I have another question. I use 300 ml of working solution to develop 35 mm.
films. the 1+50 dilution requires really little amounts of stock developer.
Is there a threshold for the stock amount to be used, any minumum limits?

A figure of 5mL has been mentioned from time to time. Agfa used to
have a pdf on their Australian web site which showed some contrast
results using 1+100 with various Agfa and non-Agfa films at 15min and
20min dev time. Although some were quite low, some were useful. At
the bottom of the pdf it says:

"The 1+100 times are recommended for hand tanks only. There should be
a minimum of 250mL solution for each film in the tank."

That leads to 2.5mL per film. It is likely that developer exhaustion
is playing a part in the low contrast results, but if 2.5mL gives
almost ok results, then maybe 4mL could be tried if you want to
minimise the consumption of the developer.