[pure-silver] Re: Kodak Wash Aid Patent
- From: Eric Nelson <emanmb@xxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Mon, 16 Apr 2007 11:51:21 -0700 (PDT)
So Richard, given the formulas discussed previously on
this list, would you suggest switching from using
sodium citrate to citric acid or a combination
thereof?
Eric
--- Richard Knoppow <dickburk@xxxxxxxxxxxxx> wrote:
>
> ----- Original Message -----
> From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
> To: <pure-silver@xxxxxxxxxxxxx>
> Sent: Tuesday, April 10, 2007 6:48 PM
> Subject: [pure-silver] Kodak Wash Aid Patent
>
>
> > I have found what I believe is the patent for
> Kodak
> > Hypo Clearing Agent. It is U.S.P. 2,860,978
>
> FWIW here is the formula given in the patent. This
> is for a
> working solution.
>
> Wash Aid
>
> Sodium Sulfite (probably desiccated) 20.0 grams
> Sodium Bisulfite 5.0 grams
> Sequestrine Na-4 (EDTA Tetrasodium Salt 0.5 grams
> Water to make 1.0 liter
>
> The packaged product also contains Citric Acid. From
> the
> MSDS I am guessing its present in the same amount as
> the
> EDTA.
> The packaged product makes a concentrate to be
> diluted 1
> part concentrat to 4 parts water so the formula
> would be:
>
> Sodium Sulfite 100.0
> grams
> Sodium Bisulfite 25.0
> grams
> EDTA Tetrasodium Salt 2.5
> grams
> Citric Acid 2.5
> grams
> Water to make 1.0
> liter
>
> ---
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@xxxxxxxxxxxxx
>
>
>
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