[pure-silver] Re: Amidol and oxidization: Oops!

Hi Rich,
Are you referring to the "Looten's Amidol Black Developer" or " Maxim Muir's Amidol Paper Developer"? 

Cheers,
Bogdan

richard lahrson wrote:


Hi!  Amidol is my paper developer for
the few graded papers that remain.  I use the
'teaspoon' formula found in the cookbook
and mix up half the amount for a printing
session.  The prints are all 5x7.  It should last
4 to 6 hours if it's not to warm.    Best, Rich

    On May 23, 2009 10:44 AM, "Jean-David Beyer"
    <jeandavid8@xxxxxxxxxxx <mailto:jeandavid8@xxxxxxxxxxx>> wrote:

    Jean-David Beyer wrote:

        Bogdan Karasek wrote:

            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"


        It may vary depending upon the formula you use. I use the
        following:

        Water around 100F      1300 ml
        Sodium sulfite           50 gm
        Citric acid crystal       8 gm
        Benzotriazole 1%         50 ml (depends on the paper)

        When cool (room temperature) add
        Amidol                   17 gm


    Water to                 2000 ml.


        Amidol is quite soluble and does not need to be dissolved in
        hot water. Hot water only makes it oxidize faster. The citric
        acid is to make it last longer.

        I find it lasts several hours -- perhaps three. After that, it
        may still be good, but it gets dark and I worry about staining.

            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????


        I guess if you want to make a larger batch, mix up the other
        stuff in the morning, and then divide it into two or three
        parts, adding the amidol just before you use it.

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

        When all is said and done, using papers such as Ilfobrom,
        Oriental Seagull, Ilford Galerie, Kodak Elite, it is not worth
        the trouble and expense of using Amidol. N.B.: I cannot say
        how it works on Azo paper and would defer to the experts.
-- .~. Jean-David Beyer Registered Linux User 85642. 
     /V\  PGP-Key: 9A2FC99A         Registered Machine   241939.
     /( )\ Shrewsbury, New Jersey    http://counter.li.org
     ^^-^^ 13:40:01 up 59 days, 19:54, 3 users, load average: 4.02,
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--
________________________________________________________________
 Bogdan Karasek
 Montréal, Québec                     bogdan(at)bogdanphoto.com
 Canada                               www.bogdanphoto.com

                    "I bear witness"
________________________________________________________________ 


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