Low Odor Chemistry

srs5694 said:

Kodak's C-41 fixer is fast and has a pretty mild odor, but I've never used it for B&W paper, so I'm not sure how quick it is for that application.

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Very. Shouldn't take more than 90 seconds tops.

Ammonia alone can act as a fixer but only with chlorided silver films
and papers; eg Azo. Silver Bromide is less soluble and silver iodide
is very nearly insoluble using ammonia. As those who use RAPID
fixers know, more time in the fixer is needed when working
with iodized film or paper. Capacity is also reduced.

Ammonia makes a fixer fast with the exception noted above.
It has little effect on capacity. It is the thiosulfate which
take the load. Dan

Ole said:

OF-1 is a "rapidised" sodium thiosulfate fixer with ammonium chloride added, and the pH adjusted for minimum odor. I don't like the smell of ammonia either.

The recipe is in (surprise!) the recipe section here in APUG.

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I will definitely try your Of-1.

It seems so that Retrophotography doesnt carry sodium thiosulfate pentahydrate. They have anhy. ones instead so how many gram do I need to replace pentahydrate?

Do you run prints in water as stop bath? I did read somewhere that you prefer bicarbonate. Why? Cheaper?

which ph do you adjust so it will work as low odour solution?
The thing is interesting that ryujis version contains ammonium thiosulfate but it keeps low odour if ph is correct. Is maintaining the right PH the key to keep low odour? Or just lack of some acids? I dont know how the formula of Ilford Rapid fix looks but it is smelly indeed.

tomasis said:

It seems so that Retrophotography doesnt carry sodium thiosulfate pentahydrate. They have anhy. ones instead so how many gram do I need to replace pentahydrate?

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Sodium thiosulfate ?

I quote S. Anchell :
The formula specifies------ You have------- Multiply by
anhydrous---------------- pentahydrate--- 1.57
pentahydrate------------- anhydrous------ 0.64

Check CAS numbers :
Sodium thiosulfate, Anhydrous CAS No.: 7772-98-7
Sodium thiosulfate, Pentahydrate or Crystalline CAS No.: 10102-17-7

Marc

Clayton Chemical makes truely odorless fixer and stop bath.