From: Sandy King (sanking@clemson.edu)
Date: 02/19/03-10:24:10 AM Z
Hi Philippe,
Thanks for the recipe. I had been meaning to try ammonium citrate
with kallitype but don't have it on hand. On the other hand I have a
very large amount of citric acid and ammonia is available everywhere.
BTW, is there any color change involved in the above process?
Sandy King
>Hi Bob,
>
>You don't need a pH meter. You just need your nose.
>Starting with a solution of citric acid, when agitating, pour slowly
>ammonia in it. Step by step. At each step, if you smell above the
>beaker, it won't smell ammonia at all. When it starts smelling
>ammonia, ad a pinch a citric acid to neutralize the smell of
>ammonia. You have perfectly pure ammonium citrate. (As the
>by-product is water).
>You don't need to know the concentrations of ammonia neither with this method,
>
>Cheers,
>
>Philippe
>
>|-----Original Message-----
>|From: Bob Kiss [mailto:bobkiss@caribsurf.com]
>|Sent: Wednesday, February 19, 2003 15:27
>|To: ALT PHO PROC.
>|Subject: DUMB QUESTIONS #107 & 108
>|
>|
>|DEAR LIST,
>| I have been getting great results processing my Pt/Pd
>|prints in Ammonium
>|Citrate and I want to continue with the same results for a
>|show where the
>|deadline is looming. I am running short on Am Cit developer
>|(I top up the
>|volume at the end of each printing session). We have many
>|things here in
>|B'dos but I cannot seem to find Ammonium Citrate and it is
>|either expensive
>|or a long wait to ship it in.
>|Dumb Q #107: Is it possible to titrate clear ammonia from the
>|grocery store
>|(no soap or anything else in it, just ammonia and water) with
>|citric acid
>|until my blue litmus paper turns just red? Won't this give me ammonium
>|citrate with just the slight acidity that Pt/Pd likes? Is the
>|store bought
>|ammonia too weak? Will this cause heating, boiling, toxic
>|gasses, and other
>|nasty results?
>|Dumb Q #108: I can get Sodium Citrate which I know is another Pt/Pd
>|developer but I believe it will yield different tones and I
>|don't want to
>|change horses in mid stream. If I cannot do #107 above, is
>|there anything I
>|can add to Sodium Citrate (I can get Ammonium Carbonate) to
>|produce Ammonium
>|Citrate? I was worried that Sodium Citrate plus Ammonium
>|Carbonate would
>|yield Ammonium Citrate plus Sodium Carbonate but that the
>|Sodium Carbonate
>|would leave the solution too alkaline to be a good Pt/Pd developer.
>|****Please give me suggested volumes and masses of the
>|ingredients. Please
>|consider that it will be a 30 km drive here in Barbados to the
>|nearest pH
>|meter.
>| So I am hoping that I can rough it suggested amounts and
>|litmus paper.
>| CHEERS!
>| BOB
>|
>|Please check out my website:
>|www.bobkiss.com
>|
>|
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