[pure-silver] Re: Chemical questions: AmmoniumThiosulphate andAscorbic Acid
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Tue, 7 Jun 2005 23:13:08 -0700
----- Original Message -----
From: "donandres" <donandresfoto@xxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Tuesday, June 07, 2005 9:31 PM
Subject: [pure-silver] Re: Chemical questions:
AmmoniumThiosulphate andAscorbic Acid
> Hi Breukel:
>
> Ok that is correc, Ascorbic acid is a developing agent and
> the basic
> component for the Kodak X-Tol film developer, now in
> production. I listen
> that Ascorbic acid is a compound related with the "A"
> Vitamin.
> Please somebody can tell more about developing with
> vitamins?
>
>
> Thanks
> Don Andres, (new)
Ascorbic acid is related to vitimin C not A. The
substance in Xtol is Sodium Isoascorbate. Ascorbic acid is a
weak developer when used alone but it has super additive
qualities similar to Hydroquinone when used with other
developers. Commercial developers use ascorbic acid with
Metol or Phenidone. It is not a direct replacement for
Hydroquinone, it is only similar in some ways in its
actions.
Xtol contains a version of Phenidone called Kodak
Dimezone-S, isoascorbic acid, Sodium sulfite, borax and
sodium hydroxide in propertions to result in Sodium
Metaborate in solution, EDTA, to sequester magnesium and
calcium carbonates in the water.
AFAIK, no other vitimins have been used as developing
agents.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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