[rollei_list] Re: XTOL Mix-It-Yourself Formula
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Mon, 26 Jul 2010 17:42:28 -0700
----- Original Message -----
From: "Marc James Small" <marcsmall@xxxxxxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Monday, July 26, 2010 12:06 AM
Subject: [rollei_list] XTOL Mix-It-Yourself Formula
What is the current acceptable mix-it-yourself
formula for XTOL? I realize that there have been
questions about the formula set out in the Kodak
patent due to differences in Ph.
Marc
Well, I have no idea who it is who could accept a do it
yourself version of a patented formula. Actually there are
three patents covering Xtol each with examples of formulas
in them.
Also, I am curious about the source of the questions
about the Kodak formula. pH is not trivial to measure, think
Ryuji Suzuki may discuss this on his Silvergrain web site.
Its possible that the packaged Kodak product is not exactly
any of the examples given in the patents, it doesn't have to
be since the patent discusses certain principles for
formulation.
BTW, Ryuji has is own formulation for a similar
developer which it is claimed is more stable. It is
proprietary.
Xtol patents are USP 5,702,875; 5,756,271; 5,853,964
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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