Atomal - Atomal 49 - Calbe 49

gerich · 2010-05-30T21:12:15+00:00

Kann ich davon ausgehen, dass der Atomal 49 baugleich mit dem Calbe 49 ist? Warum ist es bisher nicht möglich gewesen, das original Agfa Atomal Rezept wiede...

gerich

Can I assume that the Atomal 49 is identical in construction to the Calbe 49? Why has it not been possible so far to bring back the original Agfa Atomal formula? This developer seems to me to be ideal for highly sensitive films such as Kodak TMZ. When I compare old results from TMZ in Atomal with current ones in DDX, the old ones seem to have finer grain than the current ones.

cfb_de

Can I assume that the Atomal 49 is identical in construction to the Calbe 49? Why has it not been possible so far to bring back the original Agfa Atomal formula? This developer seems to me to be ideal for highly sensitive films such as Kodak TMZ. When I compare old results from TMZ in Atomal with current ones in DDX, the old ones seem to have finer grain than the current ones.

Trying to clarify these questions here in a single post would be a rather pointless waste of time. It would be better to use the search function, perhaps supplemented by a phone call to Mirko. That way, you can get straight to the point and make use of direct sources of information. Best regards, Franz (who is now simply too lazy to go back and research the history of an Agfa formula No. 49)

CPD

Hi Franz,

Franz (who’s just too lazy to go back and dig up the story of Agfa formula No. 49)

Laziness aside. I thought the recipe required a substance that’s no longer available. Then the fish is cleaned anyway. :D Ciao! CP

gerich

The substance is N-hydroxyethyl-ortho-aminophenol, CAS 83732-79-0 The formula published after the war: Solution A: 6g N-hydroxyethyl-ortho-aminophenol 10g pyrocatechol 4g hydroquinone Solution B: 100g anhydrous sodium sulphite 25g anhydrous sodium carbonate 1g KBr I have read the history of Atomal on the Phototec Forum; according to this, the formula was altered at some point in the 1950s. I do not know whether the possible unavailability of this substance was the reason Agfa discontinued Atomal.