[pure-silver] Re: HCA (was dichroic fog)
- From: Eric Nelson <emanmb@xxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Wed, 5 Apr 2006 16:16:58 -0700 (PDT)
So I take it the consensus here is that 2-5 gms of
EDTA and sodium citrate (not citric acid, right?)
should be used with this wash aid formula with hard
city water and especially if the solutions will be
stored in stock dilutions.
I just want to use a safe mixture without calcium
scale risks, etc. I use a gallon of stock every 2-3
weeks so comparatively, an extra gram or 2 of one or 2
compounds doesn't tip the scale much in terms of cost
for me.
Eric
--- Ryuji Suzuki <rs@xxxxxxxxxxxxxxx> wrote:
> On Wed, 5 Apr 2006 09:09:11 -0400, "Koch, Gerald"
> <gkoch02@xxxxxxxxxx>
> said:
> > Five grams each of EDTA and citric acid represent
> the maximum percentage
> > as listed in the MSDS. As Richard suggested 2
> grams each is probably a
> > more realistic amount and would save money.
> Actually when I use a
> > clearing agent I make it extemporaneously using
> spoon measure and
> > discard it after the session. The EDTA and citric
> acid are not needed
> > then and the darkroom is not cluttered with jugs
> and tanks.
>
> Necessity of EDTA and citrate comes from the kind of
> water and fixer
> used, as Richard cited Henn et al, and it is
> independent of whether you
> use it one shot or not.
>
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