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Photo Forum / Film Photography / Darkroom / June 2005

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Formula req

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Duncan Allan - 18 Jun 2005 15:00 GMT
Does anyone have the formula for Rodinal.

I'd appreciate it if someone could post or email me.

TIA Duncan
Alan Smithee - 18 Jun 2005 15:23 GMT
> Does anyone have the formula for Rodinal.
>
> I'd appreciate it if someone could post or email me.
>
> TIA Duncan

Hot water                  1000ml
Para-Aminophenol            100gm
Potassium Metabisulfite     300gm
Potassium Hydroxide (50% Sol)
Add until precipitate is almost but not entirely dissolved.
Duncan Allan - 18 Jun 2005 16:43 GMT
Thank you for such a swift post, Thanks.

Duncan

> > Does anyone have the formula for Rodinal.
> >
[quoted text clipped - 7 lines]
> Potassium Hydroxide (50% Sol)
> Add until precipitate is almost but not entirely dissolved.
Richard Knoppow - 18 Jun 2005 23:26 GMT
> Does anyone have the formula for Rodinal.
>
> I'd appreciate it if someone could post or email me.
>
> TIA Duncan

  The actual formula and method of mixing for Rodinal is
proprietary but there have been many published formulae for
what is supposed to be the same thing. I have two formulas
at least. Here is one that seems to be reliable. I have not
tried this so can't vouch for it. If you try it please let
me know if it works.
  I note that the current label on Rodinal indicates it has
some EDTA in it but this would not have been in the
original. EDTA is a sequestering agent which can serve to
help other chemicals go into solution better.

Rodinal Formula No.1, from _The Film Developing Cookbook_

Solution A
Water (at 125F or 52C)                750.0 ml
para-aminophenol hydrochloride        100.0 grams
Potassium Metabisulfite               300.0 grams
Cold water to make                      1.0 liter

Solution B
Cold water                            300.0 ml
Sodium Hydroxide                      200.0 grams
Cold water to make                    400.0 ml

 Allow solution A to cool. A precipitate of p-aminophenol
will form. Place solution A in an ice water bath and slowly
add solution B with continuous stirring until a sudden
darkening of color takes place. Finally, add drop by drop,
Solution B until only a few crystals of the precipitate
remain. These crystals are important if the mixture is to
have long life.
  In other formulas for Rodinal it is suggested that a
small amount of p-aminophenol hydrochloride can be added if
all the precipitate should dissolve. It is added until a few
crystals remain.
  The label of current Rodinal indicates it has some
Potassium bromide in it. Although p-aminophenol is supposed
to be a low fog developer the presense of the hydroxide may
require some bromide as an anti-foggant. I don't know how
much to add. Bromide can also be added to the working
solution. Perhaps a gram per liter.
  I can't now remember the source for the other detailed
instructions for making Rodinal but will look in a couple of
places for it.

 Note that most other formulas I've seen for Rodinal
prescribe Potassium hydroxide. Potassium hydroxide is what
is listed in the Rodinal MSDS and on the label. Potassium
hydroxide has the advantage of dissolving in grater
concentration than Sodium hydroxide.

 Safety Note: Both Sodium and Potassium Hydroxide are very
exothermic, i.e., generate copious amounts of heat when they
go into solution. Dissolve either in cold water in a
heatproof and shatter proof container. Dissolve them slowly.
Wear protective clothing, gloves, and eye protection when
mixing them.

Signature

---
Richard Knoppow
Los Angeles, CA, USA
dickburk@ix.netcom.com


nailer - 19 Jun 2005 08:14 GMT
*
* EDTA is a sequestering agent which can serve to
*help other chemicals go into solution better.
not correct, EDTA or any other sequestering agent is to dissolve
calcium/magnesium salts forming unsoluble deposits.
*

*   The label of current Rodinal indicates it has some
*Potassium bromide in it. Although p-aminophenol is supposed
*to be a low fog developer the presense of the hydroxide may
*require some bromide as an anti-foggant. I don't know how
*much to add. Bromide can also be added to the working
*solution. Perhaps a gram per liter.

probably too much for a working solution.
Richard Knoppow - 19 Jun 2005 13:30 GMT
  EDTA has several functions. Sequestering permanent hardness is one
of them, it does that by making othewise insoluble substances soluble.
It can do the same for the components of the developer.
  My guess about the bromide is based on the amount used in other
developers.   However, without knowing the true Rodinal formula its a
little difficult to say just how much should be used. However, I didn't
state the dilution.  Probably a gram would be right for the lowest
dilution, around 1:25 and too much for higher dilutions.

Richard Knoppow
dickburk@ix.netcom.com
nailer - 20 Jun 2005 10:04 GMT
Richard,
with all respect, you are wrong. I challange you to support your
statement with hard evidence or a reference to scientific publication
-
how can EDTA do anything else than to dissolve insoluble salts of
magnesium and calcium?

please explain "it can do the same for the component of the
developer".

*   EDTA has several functions. Sequestering permanent hardness is one
*of them, it does that by making othewise insoluble substances soluble.
*It can do the same for the components of the developer.
*   My guess about the bromide is based on the amount used in other
*developers.   However, without knowing the true Rodinal formula its a
*little difficult to say just how much should be used. However, I didn't
*state the dilution.  Probably a gram would be right for the lowest
*dilution, around 1:25 and too much for higher dilutions.
*
*Richard Knoppow
*dickburk@ix.netcom.com
Richard Knoppow - 21 Jun 2005 09:46 GMT
  Well, I am not a chemist so I may be wrong. EDTA, as I understand
it, can bind metal ions of many types. These include the anions of
magnesium and calcium carbonates, which are the most common permanent
hardness in water. They may or may not also tend to help keep the high
concentraton of potassium carbonate in Rodinal in solution. I don't
know for certain. EDTA is certainly used in many packaged developers
and fixing baths to avoid a deposit of mineral matter on the film or
paper.
   I suggest that if you think I am wrong that you provide a good
explanation of what EDTA does at a level people who read this group can
understand.
  I will ask a friend who is a Phd chemist about this because I am
curious myself. If I learn anything useful I will post back to this
thread.

Richard Knoppow
dickburk@ix.netcom.com
nailer - 21 Jun 2005 14:15 GMT
Richard,
you expect too much. Unlike you, I do not have time to teach people
basics of chemistry, I can only suggest anyone to consult a text-book
on analytical chemistry, chapter dedicated to complexometry.

EDTA does NOT form complexes with monovalent cations, like sodium or
potassium. It does form complexes with Ca, Mg and other two- valent
cations as well as heavy metals.
EDTA does NOT bind anions!!
EDTA does NOT help to keep high concentration of KOH (see above)
The ONLY reason to add EDTA or similar compounds is to prevent
deposits of calcium and magnesium salts.

As I said, chemistry of EDTA is very well known and described in
monografies as well as in ordinary text books on analytical chemistry.
If you wish to learn, check in your local library or at the nearest
uni. Titration with EDTA uis one of the most common tests (water
hardness, for example).

*
*   Well, I am not a chemist so I may be wrong. EDTA, as I understand
*it, can bind metal ions of many types. These include the anions of
*magnesium and calcium carbonates, which are the most common permanent
*hardness in water. They may or may not also tend to help keep the high
*concentraton of potassium carbonate in Rodinal in solution. I don't
*know for certain. EDTA is certainly used in many packaged developers
*and fixing baths to avoid a deposit of mineral matter on the film or
*paper.
*    I suggest that if you think I am wrong that you provide a good
*explanation of what EDTA does at a level people who read this group can
*understand.
*   I will ask a friend who is a Phd chemist about this because I am
*curious myself. If I learn anything useful I will post back to this
*thread.
*
*Richard Knoppow
*dickburk@ix.netcom.com
Duncan Allan - 21 Jun 2005 16:34 GMT
It seems as though my original post for the Rodinal formula has diverted on
an interesting tangent.

I have become MORE interested in the chemical side of photography than I
ever was pre-digital! But I had a look at

http://en.wikipedia.org/wiki/EDTA

to see what the discussion was about. Thought it would be helpful for all
who are following this thread.

Regards Duncan

> Richard,
> you expect too much. Unlike you, I do not have time to teach people
[quoted text clipped - 33 lines]
> *Richard Knoppow
> *dickburk@ix.netcom.com
Richard Knoppow - 22 Jun 2005 02:51 GMT
> Richard,
> you expect too much. Unlike you, I do not have time to
[quoted text clipped - 3 lines]
> on analytical chemistry, chapter dedicated to
> complexometry.

  Then do not take part in groups like this. The purpose of
news groups is to exchange knowledge. You have no idea what
I do or who I am outside this group so don't guess about
time and make comparisons. I am BTW always very suspicious
of this sort of excuse for being parsimonious with
knowledge.
  I DO try to share whatever knowledge I have. I try to
have information which is correct, but I am, like most
photographers, not a specialist in the sometimes complex
areas of specialty, like organic chemistry, on which it is
based.
  Others, who do have the specialized knowledge, have, in
the past, been very generous with their time and knowledge.
For example, I suggest you do a Google search for Michael
Gudzinowicz, a Phd chemist who used to post to this group
often.
  I know that tritration with EDTA is a standard method of
measuring water "hardness".

Signature

---
Richard Knoppow
Los Angeles, CA, USA
dickburk@ix.netcom.com

Travis Porco - 22 Jun 2005 03:57 GMT
>> Richard,
>> you expect too much. Unlike you, I do not have time to
[quoted text clipped - 3 lines]
>> on analytical chemistry, chapter dedicated to
>> complexometry.

>   Then do not take part in groups like this. The purpose of
>news groups is to exchange knowledge.
...
>   Others, who do have the specialized knowledge, have, in
>the past, been very generous with their time and knowledge.
>For example, I suggest you do a Google search for Michael
>Gudzinowicz, a Phd chemist who used to post to this group
>often.

A lot of us appreciate thoughtful responses.

The thoughtful and informative posts are what makes this group shine, and
separates this newsgroup from the usual net.dreck: FUD posts,
my equipment vs. your equipment, end of this or that
nigh, "I'm smart but I can't follow a trivial hyperlink and have never heard
of google", "I have no idea what the operating or break-even costs are for
making and distributing my favorite product, but I'm sure everyone who
disagrees with my business strategy must be an evil idiot", etc.  Enjoy the
good stuff, man.
[And yes, this post is labeled OT too.]
nailer - 22 Jun 2005 08:20 GMT
Richard,
I have to say - you are rude person. It is not your business, what I
am doing here. It is not a requirement to participate or participate
in a certain way. If you do not like it, create your own forum
elswhere.
I have sufficient idea about you from your posts. I appreciate your
input, which is valuable for less advanced photographers. However,
I've noticed that chemistry is not your strength. If you want to
educate others, you need to learn more, otherwise you will make more
mistakes. Some people consider you as a guru, do not fail them.
I do not need to consult M. Gudzinowicz, I am very well conversant
with the subject.
I understand you are upset because I demonstrated your shortcomings.
A wise man would just admit his fault and move on. Just learn from
your mistake, do not offend others.
Finally, I sugest, we finish being personal? OK?

On Wed, 22 Jun 2005 01:51:47 GMT, "Richard Knoppow"
<dickburk@ix.netcom.com> wrote:

*
*"nailer" <unlisted@due2spam.on.net> wrote in message
*news:4t2gb1h6pl45putg8k2bep09boi3i8fcc9@4ax.com...
*> Richard,
*> you expect too much. Unlike you, I do not have time to
*> teach people
*> basics of chemistry, I can only suggest anyone to consult
*> a text-book
*> on analytical chemistry, chapter dedicated to
*> complexometry.
*
*   Then do not take part in groups like this. The purpose of
*news groups is to exchange knowledge. You have no idea what
*I do or who I am outside this group so don't guess about
*time and make comparisons. I am BTW always very suspicious
*of this sort of excuse for being parsimonious with
*knowledge.
*   I DO try to share whatever knowledge I have. I try to
*have information which is correct, but I am, like most
*photographers, not a specialist in the sometimes complex
*areas of specialty, like organic chemistry, on which it is
*based.
*   Others, who do have the specialized knowledge, have, in
*the past, been very generous with their time and knowledge.
*For example, I suggest you do a Google search for Michael
*Gudzinowicz, a Phd chemist who used to post to this group
*often.
*   I know that tritration with EDTA is a standard method of
*measuring water "hardness".
Richard Knoppow - 22 Jun 2005 08:59 GMT
   No it is not OK and I suggest you are the one guilty of rudness.
You made it my business by the way you answered my post. I have also
been a very long time participant here which also gives me some
interest in the way things are conducted.

To answer some specific points:
  I have made it clear in the past that I am not a chemist. I do,
however, try to get my information from well recognized sources
including those texts that have become standard in the art. If you spot
an error that's fine, but you must do more than simply throw a rock at
it.
  I have never claimed to be a guru, if others think I am its not my
doing. They may have found my posts helpful.
   What I know about photography comes from a lifelong passion and
curiosity for it.  It has driven me to learn something about some
pretty obscure specialties like optics and photographic chemistry.
   You are also evidently not very good at reading. My suggestion
about looking up Mike Gudzinowicz's posts was not to learn photo
chemistry but rather as an example of someone who was generous with his
knowledge and was capable of taking the time to explain somewhat
difficult subjects in an understandable way. The fact is that you _do_
need to see how this is done. It is certainly not done by starting off
a post with "Wrong!" as you have done.  As far as being offensive
perhaps you don't get the point that there was plenty of offence on
your side.
  Frankly, there is something very strange here, perhaps a little
trolling going on.
Getting personal and then expecting the other guy to just go away is
typical troll technique.
  Please notice that I supplied a good anwer to the original post. You
contributed nothing.

Richard Knoppow
dickburk@ix.netcom.com
Lloyd Erlick - 22 Jun 2005 13:26 GMT
... perhaps a little
>trolling going on.
>Getting personal and then expecting the other guy to just go away is
>typical troll technique.
...

jun2205 from Lloyd Erlick,

I think you are absolutely right!

And thank you, Richard, for not repeating the
troll. It seems my filters have worked -- I
see no evidence of the post to which you are
responding. What a pleasure!

regards,
--le
Signature

________________________________
Lloyd Erlick Portraits, Toronto.
voice: 416-686-0326
email: portrait@heylloyd.com
net: www.heylloyd.com
________________________________

John - 22 Jun 2005 11:42 GMT
> I have to say - you are rude person

    Son, could you come down to Tennessee ? I'd like to introduce you to a few
of the natives. Bore and Bubba. The first will make sure you get plenty of
exercise and the second will teach you a few facts of life.

    In the 8~9 years I've participated in this group, Richard has NEVER been
rude.
Signature

John - www.puresilver.org

Michael Gudzinowicz - 23 Jun 2005 04:37 GMT
>>I have to say - you are rude person
>
[quoted text clipped - 4 lines]
>     In the 8~9 years I've participated in this group, Richard has NEVER been
> rude.

Yo John Bouy!

The blues are blitzin' and the stripers have stocked the bay. It's
frightin' to hear that yer kin B & B are out wanderin' around. Say "Hi!"
to little Billie Jean and Billy Gene, and their mom, Billie Bobbette.
And whatever happened to Bustah and the Bigfoot?

Since you are the keeper of all posts on p-AP, please add Richard's
first reply to the archive.

Some speculation arising from that post:

Richard wrote:

>  I note that the current label on Rodinal indicates it has
> some EDTA in it but this would not have been in the
> original. EDTA is a sequestering agent which can serve to
> help other chemicals go into solution better.

Rodinal is quite basic and will absorb carbon dioxide after repeated
exposure to air. The EDTA may be there to chelate any calcium in the
water to prevent the eventual precipitation of calcium carbonate or
metal hydroxides in the working solution, since Agfa has no control over
the water used for dilution. It's not a bad idea to use EDTA in caustic
developers, but it may not be necessary.

After Agfa pulled the cork from the bottles, they didn't back titrate
with bisulfite to get a few crystals by way of the pH adjustment
(another way of setting the pH). Perhaps they had production line
problems with precipitates. The inclusion of EDTA could also reflect an
in-house production problem. Unfortunately the failure to decrease the
pH to a point where a small precipitate of pAP forms shortened Rodinal's
concentrate shelf life.

There's some additional info on stability at (one line):

http://groups-beta.google.com/group/rec.photo.darkroom/browse_thread/
thread/2c6a9064c0693ca2/c72091a611cfaf87?q=gudzinowicz+potassium+bromide
+concentration+restrainer&rnum=6#c72091a611cfaf87

Richard wrote:

> The label of current Rodinal indicates it has some
> Potassium bromide in it. Although p-aminophenol is supposed
> to be a low fog developer the presense of the hydroxide may
> require some bromide as an anti-foggant. I don't know how
> much to add. Bromide can also be added to the working
> solution. Perhaps a gram per liter.

Someone did the work, and the optimal bromide restrainer concentration
was found to be 0.35 to 0.5 g/l. A gram per liter works without
additional speed loss. The effect is to convert a long toe into a short
toe film by suppressing fog. Again, it may or may not be important. Some
high iodide content emulsions may not respond since they are already
restrained.

(Forward all flames to Bill Troop, who probably has some inside
information. I'm outa here - wonder why?)

Take care,

Mike
John - 23 Jun 2005 15:27 GMT

>>>I have to say - you are rude person
>>
[quoted text clipped - 8 lines]
>
> The blues are blitzin' and the stripers have stocked the bay.

    'bout time ! Give them my best and hopefully I'll be seein' a few of them
this fall at Tybee.

> It's frightin' to hear that yer kin B & B are out wanderin' around. Say "Hi!"
> to little Billie Jean and Billy Gene, and their mom, Billie Bobbette.
> And whatever happened to Bustah and the Bigfoot?

    Doin' well. They have a radio show in Nashville.

        http://www.rickandbubba.com/

    Billie Jean's now selling sausage to all of the "new country" stars
Leipers Fork. I figger cholesterol will rid us of "new country" in a few
years.

> Since you are the keeper of all posts on p-AP, please add Richard's
> first reply to the archive.

    I still keep everything of value in Agent however I've now started using
Dialog which has multi-server (news and mail) capabilities. Of course you
have to know how to right SQL statements for the rules.

    Schools out ! Got 97. K's very proud. They want me to go year-round next
year. I told them I have to get a little more work done before that can
happen.

    Have the teach comin' over for dinner one night this summer. Tradin'
photo-work for aligning the 138. Of course I'll have to put the CLS301 back
together first.

> Some speculation arising from that post:

> <SNIP>

> There's some additional info on stability at (one line):
>
> http://groups-beta.google.com/group/rec.photo.darkroom/browse_thread/
> thread/2c6a9064c0693ca2/c72091a611cfaf87?q=gudzinowicz+potassium+bromide
> +concentration+restrainer&rnum=6#c72091a611cfaf87

    Those were the days ! Unfortunately r.p.d. seems to get few really good
contributors anymore. I'm afraid that digital has taken it's toll here as
well.'tween digital and trolls anyway.

> (Forward all flames to Bill Troop, who probably has some inside
> information. I'm outa here - wonder why?)

    'cause fish are smarter than most people.

    Got the next 4 days off to rebuild the bike, fix the car and the porch.
Yep, I'm home !

Signature

John - www.puresilver.org

Jean-David Beyer - 22 Jun 2005 12:22 GMT
> Richard,
> I have to say - you are rude person.

You must have confused Richard with someone else. Richard Knoppow is never rude.

> It is not your business, what I
> am doing here. It is not a requirement to participate or participate
> in a certain way. If you do not like it, create your own forum
> elswhere.

Now _that_ is rude.

> I have sufficient idea about you from your posts.

But you are an amateur at rudeness. Consider the following, directed (years
ago) at me:

> Hey sh.t for brains. If you would read the post, if you can read, I was
> responding to a question. People in this newsgroup warned me about your
> arrogance. Do you live in a retard home or something?

I was pretty proud of my response at the time. Old timers here may remember
this flame war:

It seems a little like that, sometimes, but actually I live in an
asylum. On the front door is a sign that says "Come Outside." My
visitors must park on the carpet. It does look a little peculiar, too.
All along what one would normally call the outer wall, which is
decorated in a tasteful interior-designed pink, are bookshelves,
also a couple of those odd three-legged tables with semicircular
tops which stand in such a way is to suggest that someone just
dropped the wall straight through them, and pictures which are
clearly designed to soothe.

The roof is kind-of strange, too. It folds back on itself like
something that Maurice C. Escher, had he been given to hard nights
on the town, which it is no part of my purpose to suggest is the
case, though it is sometimes hard, looking at his pictures,
particularly the one with all the awkward steps, not to wonder, might
have dreamed up after having been on one, for the little chandeliers
which should be hanging inside are on the outside pointing up.
Some people find this confusing.
Inside is where the Outside is. Rough brickwork, nicely done pointing,
gutters in good repair, a garden path, a couple of small trees,
some rooms leading off.

Inside, over the front door is a
sign which reads:
"Hold stick near center of its length. Moisten pointed end in mouth.
Insert in tooth space, blunt end next to gum. Use gentle in-out
motion."

You might feel quite at home here, once you learned how to fit in.

I wonder if the O.P. in this little flame war was your father?

> I appreciate your
> input, which is valuable for less advanced photographers. However,
> I've noticed that chemistry is not your strength. If you want to
> educate others, you need to learn more, otherwise you will make more
> mistakes. Some people consider you as a guru, do not fail them.

Arrant arrogance.

> I do not need to consult M. Gudzinowicz, I am very well conversant
> with the subject.

How fortunate for you.

> I understand you are upset because I demonstrated your shortcomings.

Fer Gawd's sake!

> A wise man would just admit his fault and move on. Just learn from
> your mistake, do not offend others.
> Finally, I sugest, we finish being personal? OK?

Who got personal? What hot button of yours did Mr. Knoppow inadvertantly push?

Signature

 .~.  Jean-David Beyer          Registered Linux User 85642.
 /V\  PGP-Key: 9A2FC99A         Registered Machine   241939.
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Alan Smithee - 22 Jun 2005 14:18 GMT
...and how exactly SIR/MADAM do you contribute to this group, whoever you
are? Nit picking aside, because that's essentially all you've done....take
it to rec.drugs.chemistry if you want a pissing match with organic chemists.

> Richard,
> I have to say - you are rude person. It is not your business, what I
[quoted text clipped - 45 lines]
> *   I know that tritration with EDTA is a standard method of
> *measuring water "hardness".
nailer - 22 Jun 2005 14:46 GMT
*...and how exactly SIR/MADAM do you contribute to this group, whoever you
*are? Nit picking aside, because that's essentially all you've done....take
*it to rec.drugs.chemistry if you want a pissing match with organic chemists.
*
For start, I indicated that R. Knoppow was wrong regarding books. Then
I indicated his lack of understanding of simple concepts of chemistry.
It may be unpleasant for Richard, but consider people blindly
following him. Richard has made a significant contribution helping
people with many tasks, but he should stay clear away from chemistry.
I wish I have a dollar for each time he missed the point.
So, my little contribution was to tell about new and interesting book,
which would enable him and others to broaden your knowledge of
photographic chemistry. My contribution was to warn Richard, he makes
mistakes. In my view mistakes that are too serious to be left
unanswered.
I am not fighter, I have no interest in drugs.
You guys act like society of mutual adoration. Maybe I am naive, but I
believe people should be more responsible for their own actions. Not
giving advice is better than giving a wrong one.
Contrary to Richards request, it is not viable to explain chemistry of
EDTA in plain text. RPD does not allow for binary files, teaching
organic chemistry without graphs, images, drawings etc is impossible.
It also requires some background, understanding of bonds, electron
configuration etc. That is best done at home or library, unless you
attend a structured course at college or uni.
Richard may be the nicest chap in the group, but it does not make him
infallible in subject of chemistry.
I am sorry for telling you that.
Andrew Price - 22 Jun 2005 20:01 GMT
<snip>

>Maybe I am naive

No, you're just a dickhead.
nailer - 23 Jun 2005 08:03 GMT
you are too shy to admit you are a dickhead. So you project on others?
What is your comment regarding EDTA in developers? Ah?
.
Listnen, little boy. You have already learnt one bad word. Now go and
wash your mouth.
Ask Mummy to teach you good manners.

*On Wed, 22 Jun 2005 13:46:07 GMT, nailer <unlisted@due2spam.on.net>
*wrote:
*
*<snip>
*
*>Maybe I am naive
*
*No, you're just a dickhead.
Jean-David Beyer - 23 Jun 2005 12:55 GMT
> you are too shy to admit you are a dickhead.

I guess someone is off his medication.

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John - 23 Jun 2005 14:28 GMT
>> you are too shy to admit you are a dickhead.
>
> I guess someone is off his medication.

    Is this Scarpetti in another guise ?
Signature

John - www.puresilver.org

Andrew Price - 23 Jun 2005 19:18 GMT
>Is this Scarpetti in another guise ?

Somehow, I don't think so.  Mr S. can be very offensive at times, but
he's never as conceited as this one.
UC - 23 Jun 2005 20:40 GMT
> >Is this Scarpetti in another guise ?
>
> Somehow, I don't think so.  Mr S. can be very offensive at times, but
> he's never as conceited as this one.

I have only one guise, and this is it....

The formula for Rodinal is proprietary (that means 'not published' for
the sake of the illiterate here). Approximations have been published
and may be found in various sources...
Richard Knoppow - 23 Jun 2005 21:07 GMT
>>> you are too shy to admit you are a dickhead.
>>
>> I guess someone is off his medication.
>
> Is this Scarpetti in another guise ?

  I don't think so. He and I have had private
correspondence and this is just not typical at all.
  I have no idea of who this is, nor do I particularly
care. Its interesting that he stated that he had looked at
some of my posts. When I checked Google for his stuff I
found that he has set his posts not to be archived so there
are only about five there. I guess he doesn't want to leave
a trail. Heigh-ho.

Signature

---
Richard Knoppow
Los Angeles, CA, USA
dickburk@ix.netcom.com

Travis Porco - 22 Jun 2005 17:36 GMT
Nailer, you're way out of line.

>Richard,
>I have to say - you are rude person. It is not your business, what I
[quoted text clipped - 42 lines]
>*   I know that tritration with EDTA is a standard method of
>*measuring water "hardness".
brownt@flash.net - 23 Jun 2005 21:10 GMT
Nailer, you're the rude one.  Your "sufficient idea" of Richard's past
posts is arrogent and hypocritical since your own posts will disappear
in a few days. Not that any of the rest of us will care what you've
said anyway. Add me to the list of people who think Richard is one of
the best members of these groups.

TB
Grunthos The Flatulent - 22 Jun 2005 23:19 GMT
Aha,
I see that a new idiot has joined our ranks.

grunthos

> Richard,
> with all respect, you are wrong. I challange you to support your
[quoted text clipped - 17 lines]
> *Richard Knoppow
> *dickburk@ix.netcom.com
nailer - 23 Jun 2005 08:00 GMT
how refreshing! so, you are sitting in front of a mirror? it is ALL
you can add to discussion on some aspects of chemistry??

Richard will be very proud and grateful for all your input. Very well
done, indeed. Is the rest of the group from the same class?

*Aha,
*I see that a new idiot has joined our ranks.
*
*
*grunthos
*
*
*nailer wrote
*
*:
*> Richard,
*> with all respect, you are wrong. I challange you to support your
*> statement with hard evidence or a reference to scientific publication
*> -
*> how can EDTA do anything else than to dissolve insoluble salts of
*> magnesium and calcium?
*>
*> please explain "it can do the same for the component of the
*> developer".
*>
*>
*> On 19 Jun 2005 05:30:06 -0700, "Richard Knoppow"
*> <dickburk@ix.netcom.com> wrote:
*>
*> *   EDTA has several functions. Sequestering permanent hardness is one
*> *of them, it does that by making othewise insoluble substances soluble.
*> *It can do the same for the components of the developer.
*> *   My guess about the bromide is based on the amount used in other
*> *developers.   However, without knowing the true Rodinal formula its a
*> *little difficult to say just how much should be used. However, I didn't
*> *state the dilution.  Probably a gram would be right for the lowest
*> *dilution, around 1:25 and too much for higher dilutions.
*> *
*> *Richard Knoppow
*> *dickburk@ix.netcom.com
Grunthos The Flatulent - 26 Jun 2005 15:32 GMT
No, I was referring to ypu. But then you seem to be too friggin' stupid
to comprehend.
 
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