[pure-silver] Re: Diafine
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Mon, 25 Feb 2008 23:32:14 -0800
----- Original Message -----
From: "Bogdan Karasek" <bkarasek@xxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Monday, February 25, 2008 9:41 PM
Subject: [pure-silver] Re: Diafine
Hi Joel,
Fuirst place I tried was The Formulary. But no go. It
was considered a hazardous material so it would have to be
shipped in a Hazmat unit, it's a bummer to ship across the
border. I read the MSDS pdf given with the ad, and
Richard K. was right in his speculation that hydroquinone
must the the culprit. In the pdf file (see below)that
comes with the ad
http://www.freestylephoto.biz/pdf/msds/acufine/Diafine_Part_A.pdf
under Hazardous Ingredients, one listing, the culprit:
hydroquinone
It occurs to me that if what you want is fine grain and
relatively low contrast you would do better with a developer
like Kodak D-23. If the film is quite high in constrast it
might need something like POTA. This is something like D-23
but made of Phenidone and sulfite rather than Metol and
sulfite. Phenidone in low pH and alone results in very low
contrast. The grain structure of microfilm will be pretty
fine no matter what developer its used in. Note that this is
something like the late, lamented Technical Pan whose
special developer Technidol was a complicated form of POTA.
Some people even used Rodinal 1:100 for TechPan with decent
results. I can't personally vouch for this.
Haz-Mat regulations all seem to me to have gone
overboard (sea polution), often confusing small amounts with
regulations which might make sense if shipping many tons of
something.
I don't know what is in Diafine that is a hazard but it
also has a phosphate (TSP, used as a sequestering agent and
alkali). Phosphates are environmental hazards because large
amounts of them affect aquatic life. Phosphates were once
very widely used in all sorts of detergents. There are
legitimate envirionmental protection issues behind most of
the materials bans but sometimes they do go too far.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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