[pure-silver] Re: Paraformaldehyde/Acetone in lith developers
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Mon, 1 Mar 2010 20:28:30 -0800
----- Original Message -----
From: "BILL WILLIAMS" <krbill_10@xxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Monday, March 01, 2010 8:05 PM
Subject: [pure-silver] Re: Paraformaldehyde/Acetone in lith
developers
The Kodak Super RT MSDS list for part A
70-75 % sodium formaldehyde bisulfite (approximately 470
grams)
16 % Hydroquinone (approximately 108 grams)
5-10 % Boric acid (7 % would be about 47 grams)
1-5 % Sodium sulfite (4 % would be about 27 grams)
1-5 % Metaphosphoric Acid hexasodium Salt(CERCLA) 3 % would
be about 20 grams
Total pkg weighs 675 grams. Makes 1 gallon
Part B is primarily Sodium Carbonate with a bit of potassium
Bromide and CERCLA
Metaphosphoric Acid hexasodium Salt is the same stuff as
Calgon-S or sodium hexametaphosphate, a well known
sequestering agent. It has also been used as an alkali in
some developers where it has the advantage of also keeping
mineral salts from being deposited on the film.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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