[pure-silver] Re: AZO and Benzotriazole for anti-fogging
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Thu, 21 May 2009 10:40:46 -0700
----- Original Message -----
From: "Michael A. Smith and Paula Chamlee"
<michaelandpaula@xxxxxxxxxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Wednesday, May 20, 2009 4:06 PM
Subject: [pure-silver] Re: AZO and Benzotriazole for
anti-fogging
Greeting Richard. It has been a long time. The amount of
KBr I recommend is to get the "right" print color, at
least to my eyes. Other factors are secondary.
Michael A. Smith
Too long. I am still in there pitching for Fox TV, I
wish I could afford to retire.
Have you and Paula ever experimented with a Phenidone
based developer for Azo or one using ascorbic acid in place
of the hydroquinone in Dektol? I think it is the
hydroquinone that is mainly responsible for the greenish
tinge in Dektol. AFAIK the only Phenidone/ascorbic acid
developer available commercially was made by Agfa Neutol
Plus but I am not absolutely sure of its contents. Amidol
works well without carbonate because it is the most powerful
of the developing agents. Others need an accelerator more
alkaline than sulfite. Since Amidol is not readily available
it might be useful to see if some variation on a standard
formula could be made to approximate it, at least to get the
green out.
I've also seen sodium carbonate blamed for the green.
It would be interesting to make up something like D-72 with
potassium carbonate or with sodium metaborate to see what
difference, if any, it makes. Curiously, the green tinge
does not seem to show up in any paper in the Kodak sample
books I have. Maybe heat drying did it.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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