[rollei_list] Re: XTOL Mix-It-Yourself Formula
- From: Chris Burck <chris.burck@xxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Tue, 27 Jul 2010 22:17:20 -0400
thanks, richard.
On 7/27/10, Richard Knoppow <dickburk@xxxxxxxxxxxxx> wrote:
>
> ----- Original Message -----
> From: "Chris Burck" <chris.burck@xxxxxxxxx>
> To: <rollei_list@xxxxxxxxxxxxx>
> Sent: Tuesday, July 27, 2010 3:30 PM
> Subject: [rollei_list] Re: XTOL Mix-It-Yourself Formula
>
>
>> richard, can you post that reply again? i'm reasonably
>> sure i
>> deciphering it correctly, but. . . .
>>
> Marc said that both diethylenetriaminepentaacetic acid
> pentasodium salt and
> 4-hydroxymethyl-4-methyl-1-phenyl-3-pyrazolidinone were
> exotic and hard to find. Both are available but the first,
> DPTA Na4 is available only in large quantities and at too
> high a price. The second is Kodak Dimezone-S a variety of
> phenidone. Its available in small quantity from
> Photographer's Formulary at reasonabl prices. I think the
> DPTA is present mainly to control dissolved iron in the
> water but may have other purposes. If the water is
> reasonably pure it may not be necessary. The formula in the
> patent is intended for commmerical packaging and must be
> capable of being mixed successfully in water containing a
> wide variety of impurities so it contains substances to deal
> with those impurities that may not be necessary where they
> are absent from the water.
> Ryuji Suzuki who has worked out a number of very good
> developers has one with similar properties to Xtol but is
> more stable. I am not sure of the state of his manufacturing
> at the moment. He wrote that he had a falling out with some
> partners who wanted to lower the quality of the products. I
> think he is making the stuff under a different name now. In
> any case Kodak seems to have overcome the problems with
> Xtol.
> BTW, Marc stated that it was not a favorite of
> commercial labs. That may be but in fact it is a self
> replenishing developer with high capacity and eminently
> suitable for continuous machines. Self-replenishing means
> that the developer itself is used as the replenisher. The
> activity is kept uniform by draining off and replacing a
> certain volume of developer on a continuing basis. Of course
> accurate control must include sensitometric tests but for a
> home lab where more volume is done than is economical using
> diluted developer on a one-shot bases, reasonably constant
> performance can be gotten by simple a replenishment
> technique.
>
> --
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@xxxxxxxxxxxxx
>
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