The latest Film Developing Cookbook indicates that anything but the very freshest stop bath doesn't stop development much more quickly than water does. The purpose is more to conserve the efficacy of the fixer.
I generally just use distilled water, as a little bit of compensatory development is just fine, and when I'm developing with staining, acid stop bath is prohibited anyway.
The latest Film Developing Cookbook indicates that anything but the very freshest stop bath doesn't stop development much more quickly than water does. The purpose is more to conserve the efficacy of the fixer.
I generally just use distilled water, as a little bit of compensatory development is just fine, and when I'm developing with staining, acid stop bath is prohibited anyway.
Who re-uses stop bath? I make it fresh each time, for film.
If it's an acidic stop bath, I do, and so do a number of people I know... At the school I teach photography at, we use an indicator stop bath, and use it until its colour starts to change.
Why? Just a few drops in the solution is all you need. Discard after use!
Why? Just a few drops in the solution is all you need. Discard after use!
Why? Just a few drops in the solution is all you need. Discard after use!
20ml/litre is not a few drops...But as Matt said, you have no clue about running a high school photo program. Your way is not the way. Personally, I'll use stop bath until it stops feeling squeaky between my fingers.
concentrated near-glacial-acetic-acid strength stuff sold as Kodak Indicator stock, nor will spills of the intermediate stock solution damage things
The film looked like burnt bacon.
Why skip this step in development when it only takes 30 seconds?
for film development, paper development, or both?
Because people like to think they have a say in what they do.
If it's an acidic stop bath, I do, and so do a number of people I know... At the school I teach photography at, we use an indicator stop bath, and use it until its colour starts to change.
Why? Just a few drops in the solution is all you need. Discard after use!
I suppose at this point in my life force of habit compels me to continue using a stop bath made from glacial acetic acid. A small amount seems to last forever since the working solution is so diluted. Other than water, stop bath is the cheapest chemical component in the developing process. Why skip this step in development when it only takes 30 seconds?
Well, an acid stop does help to extend the life of acidic fixers.
I wonder how much water is required to effectively stop development, and reduce the alkalinity, before placing the film in the fixer. I'm thinking that it would take a few litres of water to do so...filling...agitating...dumping...filling...agitating...dumping, etc, etc... Sounds time consuming, and wasteful. I could not do that in the classroom darkroom.
Both.
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