Re: When to tone?

-----Original Message-----
From: Ryuji Suzuki <rs@silvergrain.org>
Sent: Nov 11, 2003 9:44 PM
To: alt-photo-process-l@sask.usask.ca, sanking@clemson.edu
Subject: Re: When to tone?

From: Sandy King <sanking@clemson.edu>
Subject: When to tone?
Date: Tue, 11 Nov 2003 20:34:45 -0400

> Is there any literature that compares the effectiveness of toning
> silver prints with either selenium or polysulfide during processing,
> while the print is still wet, as opposed to drying them first and
> toning several days or weeks later?

I don't think that issue was studied and published (Do you know,
Richard?), but I don't see why/how that difference affects unless the
image degradation is already started while storage. There can be some
minor differences such as slight difference in necessary processing
time, resulting hue, etc. but it shouldn't be any larger than
day-to-day variation of usual darkroom practice.

--
Ryuji Suzuki
"Reality has always had too many heads." (Bob Dylan, Cold Irons Bound, 1997)
 I've never seen anything, which doesn't mean no one has ever tested it. I can't see why it would make a difference. 
  There are methods of testing for the degree of toning by using a dichromate bleach and for the degree of protection against oxidation by using a hydrogen peroxide solution. 
  I am at work at the moment so don't have access to references. I will post something more later. 
  For Ryuji, I can't find a specific reference to copper as a fogging agent. I thought I had seen this in Mees and in the motion picture processing book Kodak published years ago. There is a recommendation in a Kodak darkroom construction booklet to avoid copper and tin because they react with developers, but nothing specific. 
  I must have read something because I am under the impression that copper is a prolific fogging agent.   
  It may well improve emulsions in very small amounts but cause problems in larger amounts, as does sulfide. 
Richard Knoppow
dickburk@ix.netcom.com
Los Angeles, CA, USA