[pure-silver] Re: Amidol and oxidization: Oops!
----- Original Message ----- From: "Bogdan Karasek" <bkarasek@xxxxxxxxxxxx> 
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Saturday, May 23, 2009 1:50 PM
Subject: [pure-silver] Re: Amidol and oxidization: Oops!



Hi Rich,
I only have the 1st ed. If you are so inclined, would it be possible to post the formula. 
Thanks.

Bogdan
At one time I had a collection of perhaps a dozen or more Amidol formulae. There is not much difference among them. Note that Amidol is a very powerful developing agent which does not need an accelerator beyond sulfte. It is non-staining, that is, it does not produce a stain image. 
Here are a few:

Kodak D-51 Acrol (Amidol) Developer
For Bromide Papers

Water, at about 125F (52C)                    750.0 ml
Sodium sulfite, dessicated                    120.0 grams
Diamino hydrochloride (Acrol, Amidol)          37.5 grams
Cold water to make                              1.0 liter
For use take 180ml of stock and 750ml of water. Add 3.0 ml of a 10% solution of potassium bromide solution.
Kodak also gives a variation where the developer is to be used for redevelopment after stain removal.
The above is the only Amidol formula I've run across that is given in the form of a stock solution. 
    No information about life is given.

Agfa/Ansco 113

Amidol                                     6.6 grams
Sodium sulfite                            44.0 grams
Potassium bromide                          0.55 gram
Water to make                              1.0 liter
If hot water is used dissolve the sodium sulfite and potassium bromide first, then dissolve the Amidol when the solution has cooled. 
Do not diulte for use.
The developer should be mixed fresh each time and used for only a small batch of prints. 

Dassonville D-2 Amidol Developer
Water, at 70F or 21C                    500.0 ml
Amidol                                    5.5 grams
Sodium sulfite, dessicated               16.5 grams
Potassium bromide                         0.6 grams
Cold water to make                        1.0 liter

Do not dilute for use.
Mix fresh at the time of use.
It has been suggested that the addition of acetic acid to the developer will lengthen its life. The acid will reduce the pH but its possible acetic acid may have other properties. Any acid will lower the activity. Edward Weston is supposed to have used an Amidol formula with both some acetic acid and BB solution. The latter was an anti fog agent put up in tablet form. While it was propritary it was probably a combination of potassium bromide and benzotriazole or possibly another organic anti-fog agent. There have been many published Amidol formulas claiming to be Weston's, I have no idea of their authenticity. It would appear that every maker of printing paper had some variation of an Amidol developer formula. The formula published by the Chamlees is as good as any and has the benefit of extensive use and experience (and having someone to ask questions of). 

--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx


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