[pure-silver] Re: D-Max with pyro

Thanks Gerald. I have sodium metaborate solution on hand already. If I want to use indicator papers to determine the pH of the fixer, would any papers of the appropriate range be ok? Perhaps even the test strips used for swimming pools?

The reason for my initial suggestion of sodium hydroxide was that the MSDS from the USA for Agfa FX-Universal lists ammonium hydroxide (0-1%). The other ingredients are ammonium thiosulphate, sodium sulphite and EDTA (acid).

John Stockdale

At 01:17 AM 16/12/2005, you wrote: 
It's hard to say how much is required.  The fixer is buffered to pH 6.1
and you must overcome that buffering system to get it above 7.0.  To be
practical you must establish a new buffering system to keep the fixer at
roughly pH 7.  That is why I suggested sodium metaborate which should
create a new buffer system.


-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Eric Neilsen
Photography
Sent: Thursday, December 15, 2005 9:59 AM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: D-Max with pyro


Gerald, Couldn't one just dilute the NaOH more and then allow for higher
volumes to be used later? I know that it will change over time if mixed
into solution, but I don't believe that it is that much. How much are
you taking about? Drops or mls at a time?

Eric

Eric Neilsen Photography
4101 Commerce Street
Suite 9
Dallas, TX 75226
http://e.neilsen.home.att.net
http://ericneilsenphotography.com

> -----Original Message-----
> From: pure-silver-bounce@xxxxxxxxxxxxx [mailto:pure-silver-
> bounce@xxxxxxxxxxxxx] On Behalf Of Koch, Gerald
> Sent: Thursday, December 15, 2005 8:30 AM
> To: pure-silver@xxxxxxxxxxxxx
> Subject: [pure-silver] Re: D-Max with pyro
>
> Sodium hydroxide, being such a strong alkali, is rather hard to
> control. I would suggest adding small amounts of sodium metaborate
> (Kodalk) until the pH of the Flexicolor fixer is what you want.  Keep
> track of the total amount for subsequent batches.  I suggest sodium
> metabrate as Kodak suggests using it instead of borax to raise the pH
> of one of their fixers.

.........

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