[pure-silver] Re: Chlor-Hydroquinone Developer (Defender 3D)
- From: "Koch, Gerald" <gkoch02@xxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Mon, 19 Jun 2006 09:02:52 -0400
While chlorohydroquinone is still available it is rather expensive. I
found a quote of 157 Euros for 500 grams. The last commercial
developer that I know of that uses chlorohydroquinone is Edwal FG-7. In
the MSDS for this product they list hydrochloric acid and
p-benzoquinone. They must synthesis the chlorohydroquinone from these
two ingredients.
-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Richard Knoppow
Sent: Friday, June 16, 2006 11:32 PM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Chlor-Hydroquinone Developer (Defender 3D)
Someone asked about catachol print developers. I am
still looking but ran across this which may be of interest. Defender
says its slightly warmer than 55D and will tone warmer than prints
developed in 55D. I have no idea if Chlorhydroquinone is still
available.
Defender 3D Stock Solution
Water (at 125F or 52C) 500.0 ml
Sodium Sulfite, dessicated 16.0 grams
Chlor-hydroquinone 4.0 grams
Sodium Carbonate, anhydrous 16.0 grams
Potassium bromide 0.5 grams
Water to make 1.0 liter
For use dilute 1 part stock with 1 part water.
Full development takes about 4 minutes.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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