Rollei R3 low speed

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piterengel - 19 Jan 2007 07:57 GMT

Hi, looking for Rollei R3 Low Speed developer I've found on MSDS these
data:

metol < 1 %
ammonium chloride < 4 %
pH 8-9
Water 77 %
Solids 23 %

Any idea on a formulation?

Thanks
P.

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Keith Tapscott. - 19 Jan 2007 13:10 GMT

piterengel Wrote:

> Hi, looking for Rollei R3 Low Speed developer I've found on MSDS these
> data:
[quoted text clipped - 9 lines]
> Thanks
> P.

The developer used to be sold as LP-Cube XS, it is a developer of th
Kodak Microdol/Ilford Perceptol type but sold as a liquid concentrat
which is diluted 1+4 and used at a recommended temperature of 24C.
The MSDS is a legal requirement and not to disclose the formula
(Patents etc for that), the formula is proprietary and not disclose
for the public domain.
If you wish to try mixing your own extra-fine grain developer, tr
Kodak D-25 or Edgar Hyman`s Microdol substitute formula.

Kodak D-25:
Metol developing agent = 7.5 grams
Sodium Sulfite ( anhydrous ) = 100 grams
Sodium Metabisulfite = 15 grams
Water to make 1 liter of stock solution.

Edgar Hyman`s Microdol Substitute:
Metol developing agent = 5 grams
Sodium Sulfite ( anhydrous ) = 100 grams
Sodium Chloride = 30 grams
Water to make 1 liter.

Commercial formulas usually contain a sequestering agent to preven
calcium scum and perhaps an anti-stain agent to help prevent dichroi
fog. I have read of components such as 2,4-dihydroxybenzophenone an
4-chlororesorcinol mentioned, but have not seen it in the actual MSD
for Microdol-X or Ilford Perceptol. Perhaps some one else could provid
some further information

--
Keith Tapscott.

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Nicholas O. Lindan - 19 Jan 2007 17:02 GMT

> Edgar Hyman`s Microdol Substitute:
> Metol developing agent = 5 grams
> Sodium Sulfite ( anhydrous ) = 100 grams
> Sodium Chloride = 30 grams
> Water to make 1 liter.

'Canning salt' is pure sodium chloride and works for this formula. Iodized
salt doesn't. Table salt, kosher salt and sea salt contain anti-caking
agents of one sort or the other. Pot. Ferricyanide [yellow prusate of soda]
is present in kosher salt. Small amounts of this substance cause latent
image bleaching, lowering the speed and contrast of the film. However, I am
sure the amount used in salt is less than used in bleaching as the bleaching
concentration, a miniscule 0.001%, is still a _very_ pale yellow.

Signature

Nicholas O. Lindan, Cleveland, Ohio
Darkroom Automation: F-Stop Timers, Enlarging Meters
http://www.nolindan.com/da/index.htm
n o lindan at ix dot netcom dot com

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Keith Tapscott. - 20 Jan 2007 10:19 GMT

Nicholas O. Lindan Wrote:

> 'Canning salt' is pure sodium chloride and works for this formula.
> Iodized
[quoted text clipped - 9 lines]
> bleaching
> concentration, a miniscule 0.001%, is still a _very_ pale yellow.

Yes the grade of salt is important, although I was assuming that
photo-grade type would be purchased from a supplier of photo-grade ra
chemicals

--
Keith Tapscott.

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Nicholas O. Lindan - 20 Jan 2007 16:36 GMT

> Yes the grade of salt is important, although I was assuming that a
> photo-grade type would be purchased from a supplier of photo-grade raw
> chemicals.

I balk at the idea of paying $5/lb for salt [or $3.50 for 10gm].
Canning salt is GEFM - Good Enough For Me -. I feel using
chemicals of a higher than needed grade to be unecological
and a needless waste.

Signature

Nicholas O. Lindan, Cleveland, Ohio
Darkroom Automation: F-Stop Timers, Enlarging Meters
http://www.nolindan.com/da/index.htm
n o lindan at ix dot netcom dot com

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Keith Tapscott. - 21 Jan 2007 13:33 GMT

Nicholas O. Lindan Wrote:

> I balk at the idea of paying $5/lb for salt [or $3.50 for 10gm].
> Canning salt is GEFM - Good Enough For Me -. I feel using
> chemicals of a higher than needed grade to be unecological
> and a needless waste.--

I agree, if canning salt is suitable and cost less, it would be wastin
money to buy the more expensive stuff from the chemical supplier of th
other components. Those starting out mixing their own will however mos
likely buy what`s available at the time from the chemical supplier, s
it is worth remembering "canning salt".
I generally buy Kodak and Ilford packaged chemicals, although I kno
many like to mix their own from scratch

--
Keith Tapscott.

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Norman Worth - 22 Jan 2007 03:58 GMT

> Hi, looking for Rollei R3 Low Speed developer I've found on MSDS these
> data:

It's strange to see ammonium chloride in a developer. I recall
something about using ammonium salts
to increase speed, but mostly I recall they have a reputation for fog
and unpredictability.

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