[pure-silver] Re: Kodak Wash Aid Patent
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Tue, 10 Apr 2007 20:59:48 -0700
----- 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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