You are right, but if you check cd-1+HQ developer on the paper and then bleach the silver - you will get a well visible brown image. In term of brightness, it will be only slightly lower than obtained with this developer w/o HQ and with alpha-naphtol instead.Tne coupling reaction of PPDox+HQ is very weak and slow, because the one group supposed to fall off is very electronegative. Much rather will HQ reduce oxidized CD-1 back to its original form.
Do you also get this brown residue if you fix with KSCN fixer?You are right, but if you check cd-1+HQ developer on the paper and then bleach the silver - you will get a well visible brown image. In term of brightness, it will be only slightly lower than obtained with this developer w/o HQ and with alpha-naphtol instead.
Didn't try, but perhaps I will check it somehow. I especially used alkaline fixer, case the literature tells than even usual acid fixer will destroy such weak dyes.Do you also get this brown residue if you fix with KSCN fixer?
One of the Orwo A-49 of that time had been published in the book (p91)
https://ia800603.us.archive.org/6/items/volgin1993/Волгин - Фотография 1000 рецептов (1993).pdf
Gerald Koch confirms this in posting 8 of this thread.@dE fENDER: I was looking at page 91 of the PDF file whose link you shared. I'm not very familiar with Russian script but it seems that one of the ingredients of Orwo A-49 is Atomal! What is this Atomal? Is it another name for HEAP?
Browsing adox.de I noticed: http://www.adox.de/Photo/adox-film-developer/atomal-49/ - where does this product sit in relation to D-76 or Microphen etc? The description makes it sound more like Perceptol but with higher film speed. I'm happy with XTOL at the moment but intrigued non-the-less.
Tom
Mirko, the keeping quality as per your site is rather short - up to 6 weeks as opposed to 6 months as it is the case with some of the competitors' products. Can you comment on that?
Kodak says 6 months for XTOL stock. I'm at 12.5 months for my XTOL working solution right now, and have seen no problems.I'm not sure about keeping my XTOL stock for 6 months but it certainly keeps for longer than 6 weeks.
I'm not sure about keeping my XTOL stock for 6 months but it certainly keeps for longer than 6 weeks.
I used M&B Promicrol way back in the 70's when I worked at M&B. Using Ilford FP4 rated at 200 ASA, it produced very good negatives. HEAP sulphate then became unobtainable due to carcinogenicity concerns and that was that.Of course, it isn't. Adox Atomal 49 is a distant descendant of Agfa Atomal-F, which is close relative to M&B Promicrol.
About 1949 year M&B pushished some research about effectiveness HEAP-developers in patent:
...
Mirko, the keeping quality as per your site is rather short - up to 6 weeks as opposed to 6 months as it is the case with some of the competitors' products. Can you comment on that?[/QUOT
I keep Atomal in fully filled 100ml bottles. Works still fine after 6 months of storage. Will probably keep even longer.
I'm using distilled (or deionized) water for mixing the powders.
Mirko, the keeping quality as per your site is rather short - up to 6 weeks as opposed to 6 months as it is the case with some of the competitors' products. Can you comment on that?
The Atomal powder in unopened, original packaging has a shelf life of at least 3 years if properly stored (dry). It is best practice to mix the stock solution just when you have some films exposed, which needed to be developed.
We are always very conservative and cautious with the shelf life data. We want the customer to be on the safe side. And as a manufacturer you have no influence on the storing conditions of the customers at their homes.
If you store the chemistry with care under optimal conditions, the shelf life can be significantly longer. Storing stock solution in completely full, brown/dark glass bottles, at a dry and dark places with a temperature in the range of 10 to max. 25°C is ideal and highly recommended. Under these conditions the shelf life of the stock solution will be extended. Using destilled or deionized water for mixing the stock solution can also help (especially if your local tap water quality is not so good).
It makes sense to make a little shelf life test at your home with your storing conditions: Keep a certain amount of stock solution for that test, store that under the recommended conditions (see above) and use it after 3, 4 and / or 6 months. Then you know whether it works under your individual storing conditions. We have lots of customers who have done that. They have experienced a longer shelf life and now know how much longer it is under their individual storing conditions at their homes.
By the way, Fotoimpex has new brown glass bottles on offer which are perfect for storing developers (stock solution and concentrate) and photo chemistry in general:
https://www.fotoimpex.com/darkroom/fotoimpex-apothekerflasche-glas-weithals-braun-1000-ml.html
Team ADOX
www.adox.de
Team Adox — looking at the listing for the glass bottles, the photo seems to show two different sizes, but only the one for 1000ml is listed. Is a smaller size available? And the stopper — is it glass only, so a glass-on-glass friction fit into the bottle neck, or does the stopper have a rubber or plastic surface?
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