A 49 vs. Atomal
Calbe A 49 is based on HQ and CD 2 (derivate of paradiaminophenylene). Undiluted usually 10 mins. I use this stuff 1:2 diluted on TMZ @ 3200, 30 mins. Gives fine grain, one of the best developers for the old Forte 400, or other grainny films where resolution is rather limited by grain size.
Originally Posted by Paul Howell
I used the Craigclu formel replaced that secret ingriedient with p-Diamino-phenylen. Strong stuff, something like 7 mins diluted 1:1 or 10 mins diluted 1:2 on 400 ASA film. Not bad, I guess I will clean out the MCM 100 bottle and prepare some "Atomal". Original Atomal seems to be less strong, as Agfapan film take 10-12 mins undiluted.
Like Rodinal - Rodinal Spezial, Atomal - Atomal FF is a different chemistry. Atomal FF being fine grain, one could get fine grain from Tri-X (Version of 1998) at 250 ASA - it just did not look like TX anymore! On the package it says B contains HQ, the total weight is 303 g chemistry for 5 litres. Developing time 6-8 mins at 20°C.
Colour? We can always use an airbrush later...
A packet of Atomal for sale. Whether it`s still usable, IDK.
Craig, there's too much sulfite in that formula to allow the stain to form. Pyrocatechin AKA catechol or pyrocatechol, is closely related to hydroquinone, which will also stain under the same conditions as catechol. I have heard that HC110 at one time or another used catechol in place of hydroquinne. It doesn't take a lot of sulfite to prevent staining. Pyrogallol is much less affected by sulfite.
[QUOTE=Dr.Kollig;173975]Calbe A 49 is based on HQ and CD 2 (derivate of paradiaminophenylene). Undiluted usually 10 mins. I use this stuff 1:2 diluted on TMZ @ 3200, 30 mins. Gives fine grain, one of the best developers for the old Forte 400, or other grainny films where resolution is rather limited by grain size. ...
That sounds a bit like Crawley's FX-10, which was one of his attempts (FX-9 and FX-10) to build an old style PPD developer with modern ingredients. FX-10 is said to work reasonably well with modern films, most of the time. Does anyone know if the the two formulas are really related and how they may be related?
Checking their current MSDS sheet for A 49 Calbe list N,N-Diethyl-1,4-phenylendiammoniumsulfat as a major ingredient.
Originally Posted by Dr.Kollig
This appears to probably be CD-1 N,N-Diethy1-1,4-Phenylene Diamine Sulfate or something very similar rather than CD-2 2-amino-5diethylamino-toluene hydrochloride.
I should add that in a variety of Patents Kodak list CD-2 as 2-amino-5diethylamino-toluene hydrochloride, the Minnesota Mining and Mineral Company do the same. But in other Patents Kodak call N,N-Diethy1-1,4-Phenylene Diamine Sulfate CD-2, 3M call it CD1 !!!!.
Checking my notes I found:
Activol No. 6 (Johnsons)
Mol Wt. 200.7
N,N-Diethyl-p-phenylenediamine hydrochloride (CA)
Activol No. 2 (Johnsons)
Tolochrome (May and Baker)
Mol Wt. 214.7
N5, N5-Diethyl-toluene-2,5-diamine hydrochloride (CA)
and then this:
Activol No. 7 (Johnsons)
Mol Wt 213.3
Which all adds to the confusion.
The MSDS also mentions Borax which is not in the Atomal formula Craig listed at the start of the thread.
Last edited by Ian Grant; 10-06-2007 at 02:48 PM. Click to view previous post history.
Reason: To add the Borax
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