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#1
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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 |
#2
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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 |
#4
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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. |
#5
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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 |
#6
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Concentrate - Stock - Working Strength?
In article ,
Jorge Omar wrote: Do people REALLY do that? Why not ? -- LF website http://members.bellatlantic.net/~gblank |
#7
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Concentrate - Stock - Working Strength?
Curiosity.
I've always used HC-110 straight from concentrate. Jorge Gregory W Blank wrote in news:ffS_b.3419$Xv2.886 @nwrddc03.gnilink.net: In article , Jorge Omar wrote: Do people REALLY do that? Why not ? |
#8
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Concentrate - Stock - Working Strength?
On 2/24/2004 5:23 PM Jorge Omar spake thus:
Gregory W Blank wrote in news:ffS_b.3419$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 |
#9
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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 |
#10
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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. |
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