----- Original Message -----
From: "Koch, Gerald" <gkoch02@xxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Tuesday, February 28, 2006 1:56 PM
Subject: [pure-silver] Re: What happens when XTOL dies
Some years ago the following formula appeared in several publications and was said to produce results similar to Microphen. The formula is a bit different than ID-68.
Distilled water (50°C) ................. 750 ml Sodium sulfite (anhy) .................. 100 g Hydroquinone ........................... 5.0 g Borax (deca) ........................... 3.0 g Boric acid ............................. 3.5 g Phenidone .............................. 0.2 g Potassium bromide ...................... 1.0 g Distilled water to make ................ 1.0 l
The DDX formula is probably OK but the above does not agree with the MSDS for Microphen although it is probably close. The Microphen MSDS includes
The ingredients of Microphen are given as:
Part A Ingred Name:HYDROQUINONE (SARA III) CAS:123-31-9 RTECS #:MX3500000 Fraction by Wt: 55-60% OSHA PEL:2 MG/M3 ACGIH TLV:2 MG/M3; 9192 EPA Rpt Qty:1 LB DOT Rpt Qty:1 LB
Ingred Name:BORIC ACID CAS:10043-35-3 RTECS #:ED4550000 Fraction by Wt: 30-35% OSHA PEL:10 MG BORATES/M3 ACGIH TLV:5 MG BORATES/M3
Ingred Name:SODIUM METABISULFITE CAS:7681-57-4 RTECS #:UX8225000 Fraction by Wt: 5-8% OSHA PEL:5 MG/M3 ACGIH TLV:5 MG/M3; 9192
Ingred Name:1-PHENYL-3-PYRAZOLIDONE CAS:92-43-3 RTECS #:UQ8750000 Fraction by Wt: 1-3%Part BIngred Name:SODIUM SULFITE CAS:7757-83-7 RTECS #:WE2150000 Fraction by Wt: 90-95%
Ingred Name:SODIUM TETRABORATE, DECAHYDRATE CAS:1303-96-4 RTECS #:VZ2275000 Fraction by Wt: 2-7% OSHA PEL:10 MG/M3 ACGIH TLV:5 MG/M3; 9192
Ingred Name:SODIUM PHOSPHATE, TRIBASIC (SARA III) CAS:7758-29-4 RTECS #:YK4570000 Fraction by Wt: 1-5% EPA Rpt Qty:5000 LBS DOT Rpt Qty:5000 LBS
Ingred Name:POTASSIUM BROMIDE CAS:7758-02-3 RTECS #:TS7650000 Fraction by Wt: 0.5-1% I calculated approximate proportions from these two by assuming that the amount of Hydroquinone in both was 5.0 grams aand the amount of Sodium Sulfite was 85.0 grams. That may be wrong. The next time I have any of the stuff I will weigh the two packages. From various data it appears that the optimum amount of Sodium sulfite for developers of this sort is around 85 grams per liter.
--- Richard Knoppow Los Angeles, CA, USA dickburk@xxxxxxxxxxxxx
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