[pure-silver] Re: Amidol and oxidization

As I recall, 2 hours max.  It basically just stops working.  So when you make 
your first batch, weigh out enough to make a 2nd batch and keep it unmixed and 
ready to go.



________________________________
From: Bogdan Karasek <bkarasek@xxxxxxxxxxxx>
To: pure-silver@xxxxxxxxxxxxx
Sent: Saturday, May 23, 2009 12:01:08 PM
Subject: [pure-silver] Amidol and oxidization

Hi all,

Again,,  a Thank You to all who responded to my query concerning AZO and 
fogging.  Very helpful responses but which lead me to other questions 
concerning AMIDOL which was mentioned as THE developer for AZO.   I've order a 
quantity of Amidol from my supplier and will be using the formula found on 
Michael A. Smith's web site.

I've done some further research into the p[properties of Amidol which I have 
never used before.   Looking through the "Darkroom CookBook", Anchell mentions, 
as have others on this group,  that Amidol oxidizes easily and should be mixed 
just before usage.

The question I have concerning AMIDOL regards the following  from 
the"CookBook":   "Oxidizes rapidly and keeps poorly"

Can anybody quantify "rapidly"

My usual darkroom work practice when using Dektol is to mix a 4 liter batch of 
1:2 Dektol and that sits in a large tray for at least 8-10 hours as I print, 
after which I dump it when I am finished at the end of the day 
What about Amidol????  How long will that keep in an open tray before it 
oxidizes and I have to dump it.... 2 hours, 4 hours, 6 hours or what?  Am I 
better off mixing a small batch, 1.5L  and changing often,   or will a  3L 
batch last longer????

From personal experience working with Amidol, can anybody quantify "oxidizes 
rapidly"

Cheers,
Bogdan    
-- ________________________________________________________________
Bogdan Karasek
Montréal, Québec                     bogdan(at)bogdanphoto.com
Canada                              www.bogdanphoto.com

                    "I bear witness"
________________________________________________________________  


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