[pure-silver] Re: Opinion Please!

  • From: John Stockdale <j.sto@xxxxxxxxxxx>
  • To: pure-silver@xxxxxxxxxxxxx
  • Date: Wed, 25 Nov 2009 14:58:49 +1000

Eric, I haven't forgotten about the Rodinal formula. I've saved a number of posts from rec.photo.darkroom especially from Michael Gudzinowicz and when I've tidied them up I'll post it.

The upshot of the posts is that Agfa altered Rodinal in, I think, the 1960s. The amount of p-aminophenol was reduced and the pH was increased to compensate. p-aminophenol is not an expensive chemical, but sodium/potassium hydroxide is much cheaper!   Reminiscences of Agfa Viradon having its only expensive ingredient removed also (selenium)!

John
=========================================
Eric Neilsen Photo wrote:

This was how PF listed it on the brown bottle; including CAS #. I don't have my formulas here at home. If you have it John, that would be great.  

 

Eric Neilsen

Eric Neilsen Photography

4101 Commerce Street, Suite 9

Dallas, TX 75226

 

www.ericneilsenphotography.com

skype me with ejprinter

 

From: pure-silver-bounce@xxxxxxxxxxxxx [mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of John Stockdale
Sent: Monday, November 23, 2009 12:01 AM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: Opinion Please!

 

Aminophenol (not the hydrochloride) is readily available, and can be used for Rodinal with some adjustments to the formula. I can look it up if you're interested.

John Stockdale
================


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