[pure-silver] Re: ddx vs d76
- From: Ryuji Suzuki <rs@xxxxxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Fri, 11 Feb 2005 18:38:06 -0500 (EST)
From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
Subject: [pure-silver] Re: ddx vs d76
Date: Fri, 11 Feb 2005 15:15:08 -0800
> A comparison of the ingredients of DDX and Microphen show
> them to be very similar except for the stuff put into DDX to
> keep the ingredients in solution. Both are
> Phenidone-Hydroquinone developers with a Borax-Boric acid
> buffer. Potassium sulfite is used because it probably can
> make a more concentrated solution than the sodium salt.
> Dielethylene glycol is a solvent. There is also a
> sequestering agent for magnesium and calcium salts in the
> water. It may also help keep things in solution.
These you used to argue "similar" do not mean they are
photographically identical, which would be a wrong message to send
unless such statement was experimentally verified.
The pH of such a highly concentrated solution is subject to change
upon dilution and I would not assume how much it will shift unless
measured.
> Microphen is a packaged version of Ilford ID-68
As far as I know they are different developers.
Microphen is said to be same as an unnumbered Ilfored formula
developed for repenished deep tank use.
--
Ryuji Suzuki
"Keep a good head and always carry a light camera."
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