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  #11  
Old 11th September 2017, 02:44 PM
MikeHeller MikeHeller is offline
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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
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  #12  
Old 11th September 2017, 04:25 PM
Lostlabours Lostlabours is offline
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Quote:
Originally Posted by MikeHeller View Post
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
The Ilford IS-1 stopbath is in your Ilford Maunal of Photography

Ian
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  #13  
Old 12th September 2017, 04:18 PM
MikeHeller MikeHeller is offline
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The Ilford IS-1 stopbath is in your Ilford Maunal of Photography

Ian
Ah, yes. 1.7% glacial acetic acid!!
Mike
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  #14  
Old 14th September 2017, 12:21 AM
Stocky Stocky is offline
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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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