Concentrate - Stock - Working Strength?
 

I know what working strength is. That is the solution strength
into which I place the film or print. But what are concentrate
and stock strength? Dan

Concentrate - Stock - Working Strength?
 

If you make up a stock solution of dektol you would make the powder up
to one gallon not put it into one gallon. Your working solution would
be when you take it out and dilute it to 1:1 as a working solution.


On 24 Feb 2004 14:26:12 -0800, (Dan Quinn) wrote:

I know what working strength is. That is the solution strength
into which I place the film or print. But what are concentrate
and stock strength? Dan

Concentrate - Stock - Working Strength?
 

In article ,
(Dan Quinn) wrote:

I know what working strength is. That is the solution strength
into which I place the film or print. But what are concentrate
and stock strength? Dan


An example of concentrate HC110 syrup--- as it is purchased from
the photo store.

An example of HC110 Stock solution would be 1 part concentrate plus 3 parts water.

Working strength = whatever, but typical would be HC110 B dilution, 1 part stock plus 7 additional parts of
water.
--
LF website http://members.bellatlantic.net/~gblank

Concentrate - Stock - Working Strength?
 

Concentrate:
A liquid bought from the store to make a Stock Solution and reserved.

Stock:
The liquid or powder mixed into a "stock" solution to be further refined at
time of use. Usually the manufacturer suggests the amount of dilution.

Working Strength.
The Stock diluted to accomplish the desired results of development, stop, fix,
rinsing, toning. Often not following the manufacturers directions.


_________________
Ready, Fire, AIM.
Bruce
Brooklyn, N.Y.

Concentrate - Stock - Working Strength?
 

I think the best example is HC-110 as per Kodak's book:
Get the concentrate (as it comes in USA bottle) and dillute it 1+3 to
make the stock solution.
Then dillute stock for your working solution.

Do people REALLY do that?

Jorge

(Dan Quinn) wrote in
om:

I know what working strength is. That is the solution strength
into which I place the film or print. But what are concentrate
and stock strength? Dan

Concentrate - Stock - Working Strength?
 

In article ,
Jorge Omar wrote:

Do people REALLY do that?

Why not ?
--
LF website http://members.bellatlantic.net/~gblank

Concentrate - Stock - Working Strength?
 

Curiosity.
I've always used HC-110 straight from concentrate.

Jorge

Gregory W Blank wrote in news:ffS_b.3419$Xv2.886
@nwrddc03.gnilink.net:

In article ,
Jorge Omar wrote:

Do people REALLY do that?

Why not ?

Concentrate - Stock - Working Strength?
 

On 2/24/2004 5:23 PM Jorge Omar spake thus:

Gregory W Blank wrote in news:ffS_b.3419$Xv2.886
@nwrddc03.gnilink.net:

In article ,
Jorge Omar wrote:

Do people REALLY do that?

Why not ?

Curiosity.
I've always used HC-110 straight from concentrate.

Same he I don't see why anyone would *want* to mix stock solution from
HC-110. More work, and it goes bad faster. The only real problem with the
alternative (mixing working solution straight from concentrate) is having to
measure small quantities, and that's easily solved with either a simple
syringe or a small graduate.


--
It's fun to demonize the neo-cons and rejoice in their discomfiture, but
don't make the mistake of thinking US foreign policy was set by Norman
Podhoretz or William Kristol. They're the clowns capering about in front of
the donkey and the elephant. The donkey says the UN should clean up after
them, and the elephant now says the donkey may have a point. Somebody has
come out with a dustpan and broom.

- Alexander Cockburn, _CounterPunch_
(http://www.counterpunch.org), 9/17/03

Concentrate - Stock - Working Strength?
 

In article ,
David Nebenzahl wrote:

Same he I don't see why anyone would *want* to mix stock solution from
HC-110. More work, and it goes bad faster. The only real problem with the
alternative (mixing working solution straight from concentrate) is having to
measure small quantities, and that's easily solved with either a simple
syringe or a small graduate.

*Unless* you only mix enough stock to make the required amount
for a batch or two of film. That way you can use a simple cough syrup
1 oz graduate, and there is no futzing around with guessing the increment
of concentrate.
--
LF website http://members.bellatlantic.net/~gblank

Concentrate - Stock - Working Strength?
 

"David Nebenzahl" wrote in message
...
On 2/24/2004 5:23 PM Jorge Omar spake thus:

Gregory W Blank wrote in
news:ffS_b.3419$Xv2.886
@nwrddc03.gnilink.net:

In article
,
Jorge Omar wrote:

Do people REALLY do that?

Why not ?

Curiosity.
I've always used HC-110 straight from concentrate.

Same he I don't see why anyone would *want* to mix
stock solution from
HC-110. More work, and it goes bad faster. The only real
problem with the
alternative (mixing working solution straight from
concentrate) is having to
measure small quantities, and that's easily solved with
either a simple
syringe or a small graduate.


--
For highly concentrated developers its sometimes easier to
measure accurately if a stock solution of intermediate
strength is made up. Generally, the more concentrate the
stock the longer it will last. A diluted stock solution of
Rodinal is probably not practical because it would oxidize
pretty quickly but HC-110 is more resistant. The concentrate
will still outlast any dilution.