[rollei_list] Re: Rolleicord IV Xenar Schneider at work
- From: CarlosMFreaza <cmfreaza@xxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Sat, 27 Feb 2010 07:19:25 -0300
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 was reading in Glafkidés that any substance with oxid-reduction
potential less than 0.120 volts can develop the photographic image and
even old Bourgogne wines with alkalines elements were used to develop
film.
Carlos
2010/2/27 Richard Knoppow <dickburk@xxxxxxxxxxxxx>:
>
> ----- Original Message ----- From: "Marc James Small"
> <marcsmall@xxxxxxxxxxx>
> To: <rollei_list@xxxxxxxxxxxxx>
> Sent: Friday, February 26, 2010 7:14 PM
> Subject: [rollei_list] Re: Rolleicord IV Xenar Schneider at work
>
>
> At 05:55 PM 2/26/2010, CarlosMFreaza wrote:
>>Perceptol is available here Richard, Xtol was never available, the
>>local Kodak did not and does not import it, anyway I'll think to
>>return to D-76, it is available easily and Romek, an Argentinean
>>photographic chemicals products factory sells raw chemicals to
>>prepare D 76 and other formulas.
>
> Carlos
>
> You can mix XTol on your own. It is a HIGHLY
> recommended developer. I can dig out the
> mix-it-yourself formula if you are interested.
>
> Marc
>
>
> The formula for Xtol in the second patent contains
> Diethylenetriaminepentaacetic Acid Pentasodium Salt
> I have no idea of how difficult this is to get. It appears to be
> sequestering agent for metal so its possible the developer will work without
> it.
> The patents are USP 5,755,271 and 5,853,964
>
>
> --
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@xxxxxxxxxxxxx
> ---
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