Archived posting to the Leica Users Group, 2002/06/24

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Subject: RE: [Leica] OT: homemade stop bath
From: Jeffery Smith <jls@runbox.com>
Date: Mon, 24 Jun 2002 17:26:34 -0500
References: <205681D3-87B6-11D6-B763-0003938ECA32@hvc.rr.com>

It's been decades since I've done wet darkroom stuff, but they used to sell 
stop bath indicator solution to tell you when it was exhausted. I never 
exhausted mine. I always leaned toward replacing instead of replenishing.

JLS

At 04:22 PM 6/24/02, you wrote:
>Water works for paper as well as film.....
>
>If you want to get fussy.....
>
>Vinegar is 5% acidity
>Glacial Acetic Acid is 28%  (GAA)
>
>You could just use 5 times more vinegar as GAA..... or,
>to 1 gallon of water... add 2 oz of GAA or 10 ounces of Vinegar....
>
>Use WHITE vinegar....
>
>The purpose of the stop is to provide an acidic environment to stop the
>development prosess, that requires a alkaline environment....
>Use of water just takes longer and does not stop as fast the development
>process.., as it dilutes the developer.... not changing the PH...
>
>
>
>Frank Filippone
>red735i@earthlink.net
>
>
>--
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In reply to: Message from "J. Gilbert Plantinga" <gilplant@hvc.rr.com> (Re: [Leica] OT: homemade stop bath)