[Leica] Adox ATM49

[chs2018 at med.cornell.edu (Chris Saganich)]

So why Sodium Sulfite at 100 g/l and Oxyethyl-ortho-aminophenol?  I would 
think you could cut back to 40-50 grams/l which would increase actuance I 
think.  Unless the Sulfite also is needed as an accelerator for the 
Oxyethyl-ortho-aminophenol, which is likely.  The reduced sulfite would 
also increase actuance by allowing the pyro to proportionally stain the 
density.

The Sodium Metaphosphate is likely used to increase the rate of 
hydroquinone developement and give maximum contrast.

The potassium bromide here would then be a restrainer, which seems 
unnecessary as the sodium metaphosphate isn't that caustic?  Not as much as 
Sodium Hydroxide at least.  If fog is a problem then perhaps a less caustic 
sodium would work.

Interesting formula to play around with.  I'll have to see if I can get 
some of the aminophenol, and Sodium Metaphosphate, both not the usual fare.


At 11:31 PM 4/21/2009, you wrote:
>ATM49 is very similar, probably the same as AGFA Atomal, which I've tried.
>  Calbe A49 is also likely close.  I have no idea what you can and cannot 
> buy
>off the shelf anymore, since I only really buy Xtol and mix everything else
>up myself.  Don't confuse Atomal with Atomal FF; they are totally different
>developers - the latter is a phenidone HQ developer.
>The formula for Agfa Atomal is:
>
>Package A:
>Oxyethyl-ortho-aminophenol 6g
>Pyrocatechin 10g
>Hydroquinone 4g
>
>Package B:
>Sodiumsulfite anhyd. 100g
>Sodiumcarbonate anhyd. 25g
>Potassium bromide 1g
>Sodium metaphosphate 1g
>
>Dissolve in 750 ml of water at 50? C.  Add cold Water to make 1 litre.
>
>It seems unnecessarily complicated to me.
>
>The o- aminophenol correctly is a silver solvent, not an active developer.
>  One of the Windisch formulae uses 0-phenylenediamine in a similar way in
>an extra-fine-grain developer where Metol is the main developing agent.
>  o-phenylenediamine is not an active reducing agent but is an effective
>solvent of silver halide.
>
>In my experience all the Agfa formulae lower midtones more than I want most
>of the time.  I was thinking that I would develop some photos that I will
>take in Prague later this year in Rodinal or Rodinal Special to take
>advantage of the dark look, but having seen this maybe I'll try Atomal.  I
>think  mostly I prefer Xtol for providing the finest grain with excellent
>acutance.
>
>You can also get a VERY similar look at much lower cost by adding 3 mL of
>Rodinal per litre of Xtol 1+4 or 1+5.  If you get fog or signs of infectious
>development due to lowering of the pH and activation of the ascorbate in the
>Xtol alone by the hydroxide in the Rodinal, add 1-2.5 g/L of borax.  This
>brings the pH back down while maintaining alkalinity and activity.
>
>Irrespective of the developer, the photos look great.  Keep at it,
>
>Marty
>
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Chris Saganich MS, CPH
Senior Physicist, Office of Health Physics
Weill Medical College of Cornell University
New York Presbyterian Hospital
chs2018 at med.cornell.edu
http://intranet.med.cornell.edu/research/health_phys/
Ph. 212.746.6964
Fax. 212.746.4800
Office A-0049