[pure-silver] Re: Anti-Silvering Agent
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Tue, 1 May 2007 17:49:45 -0700
----- Original Message -----
From: "Jordan Wosnick" <jwosnick@xxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Tuesday, May 01, 2007 5:28 PM
Subject: [pure-silver] Re: Anti-Silvering Agent
Chlororesorcinol probably smells -- a very
"chemical"-like, somewhat phenolic smell. The parent
(resorcinol) certainly smells and I'm pretty sure that
bromoresorcinol smells too.
Anyone know if Microdol-X (the powder) smells?
Richard Knoppow wrote:
Snipping here....
It does not nor does Perceptol. The other patents I
posted suggest there may be another agent involved several
are mentioned in this patent. Haist suggests somewhere that
the agent may be a Mercaptan. It seems that there must be
much of a secret about this because Ilford Perceptol appears
to be identical to Microdol-X.
I got interested in these developers because they are
truly very fine grain and have good tonal rendition. I use
35mm T-Max 100 developed in full strength Perceptol and get
negatives which begin to have the smooth tone rendition one
expects to get with larger negatives. I shoot at EI-50 and
develop pretty much according to the data sheet. I suggest
this combination to those who miss Technical Pan. It is
certainly not identical but has nearly the fineness of grain
and very high resolution. It is also about four times the
speed and is not at all fussy about contrast control.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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