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> Acetic stop bath |
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When I used to liberate glacial acetic acid from work for photographic use, I seem to remember I used it at 2% solution and single use; it was in the days before I had a toaster. My 1966 edition of Ilford Manual of Photography says 1%.
Mike |
#12
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Ian |
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Mike |
#14
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Ryuji Suzuki posted (I don't remember where) a buffered acetic acid stop bath with adequately low pH but not particularly low. The alternative formula using 90% acetic acid and sodium hydroxide (both dangerous if mishandled) would be cheaper than sourcing sodium acetate. I haven't tried it (I use bisulphite stop in my Nova). His comment about the inconvenience of draining the Nova is because he was using the early simple one with drain outlets not at the bottom.
=======start of pasted article: buffered stop bath (replenishable) Written by Ryuji Posted: 06:09 AM - 01-19-2005 acetic acid, 90% 20ml sodium acetate 80g water to make 1.0 liter target pH 5.0 plus/minus 0.5 same thing can be made this way: acetic acid, 90% 60ml sodium hydroxide 25g water to make 1.0 liter target pH 5.0 p/m 0.5 Either bath can be replenished at the rate of 30 ml glacial acetic acid per each 30 of 80 sqi processed. Buffered stop bath may appear more expensive but lasts MUCH longer than 1.7% acetic acid bath. The replenishing capability is very useful for Nova slot processor because changing the entire bath is a real pain in that processor. Last edited by Stocky; 14th September 2017 at 12:24 AM. Reason: addition |
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