[rollei_list] Re: Rolleicord IV Xenar Schneider at work
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Sat, 27 Feb 2010 06:45:42 -0800
----- Original Message -----
From: "CarlosMFreaza" <cmfreaza@xxxxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Saturday, February 27, 2010 2:19 AM
Subject: [rollei_list] Re: Rolleicord IV Xenar Schneider at
work
Thank you very much Marc and Richard for the suggestions, I
already
had the Xtol formula obtained from a web page dedicated to
this
developer.
Richard, I couldn't find the patents numbers you mentioned,
according
Michael Covington in the webpage on Xtol, the US patent is
5,853,964
and this number works in Google patents, it is from 1998;
anyway some
of the components look difficult to find and they are not
listed in
the Digitaltruth raw chemicals products list.
The formula is at the end of the page:
http://www.covingtoninnovations.com/xtol/
I mis-typed.
USP 5,756,271 and USP 5,702875
I probably have this one too but downloaded it to be
sure. The dry formula appears to be identical with the
earlier patents. I will have to read it carefully to see
what the differences are.
The DPTA appears to be the only difficult chemical to
obtain although Kodak Dimezone, the version of Phenidone
used, may also be a problem. Sodium Metaborate (AKA Kodalk)
can be made by adding sodium hydroxide and Borax in
solution.
Its interesting that much of the patent is taken up
with a liquid concentrate version of the developer. AFAIK,
no such has ever been marketed.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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