question about chemical developers

"Nicholas O. Lindan" wrote in message
link.net...
o Although small quantities are required for life, consumption
results in certain death from sodium channel depolarization and
subsequent cessation of coronary function.


Just goes to show you, anything in sufficient quantity will cause some form
of harm to the human being.

Beppe, I'm not a medical specialist or a chemist, so my opinion is only=20
that of a reasonably informed layman. As far as I know, none of the=20
chemicals I mentioned are carcinogens, nor are the ones in the=20
developers you mentioned. Selectol does contain metol, which can cause=20
skin irritation in a few people, but it is not terribly toxic. I've=20
been mixing chemicals for more than 35 years and have never had a bad=20
reaction or any sort of problem with any of them.

Larry

Beppe Albor=E8 wrote:

thanks for your help.
i've just a little question for you:
in your opinion, are the following products carcinogenic, or carcinogeni=
c
suspected ?

negative film developer: kodak xtol

paper developers: kodak ektaflo, kodak selectol

thanks!






"LR Kalajainen" wrote in message
...
Here's a very simple mix-it-yourself formula using harmless chemicals,
similar to commercial developers such as Xtol or Agfa Neutol. All the
chemicals you can get at your local hardware store or supermarket. I've=

been using this formula for Delta-400, Delta-100, Fuji ACROS 100 and
Fuji Neopan with outstanding results:

6 g. Sodium carbonate (this is a common chemical used in dishwasher
detergents or marketed as Arm & Hammer Washing Soda, if that's available=

in Italy.) Alternatively, you can buy it from any chemical supply
house. It's also sold in swimming pool supply stores as "pH Plus" or
something similar.

4 g. Vitamin C (ascorbic acid) powder or crystals, available in any
natural food or health food store.

4 ml. 1% Phenidone solution (dissolve 1 g Phenidone powder--the only
chemical you must buy from a proper chemical supply place-- in 100 ml of=

90% alcohol.) Phenidone will dissolve in water, but it takes longer.
The alcohol preserves it well, and a 100 ml bottle will last months.

1 liter of water.

At 22 degrees Celsius, Delta 100 or Fuji ACROS or Fuji Neopan will
develop in approximately 7 minutes. You may have to experiment a bit to=

find the best time for you. I rate those films at one stop less than
their manufacturer-recommended speed, so Delta 100 at ISO 50, etc.

For Delta 400, you may want to substitute borax for the sodium carbonate=

or your times may be too short. With borax, Delta 400 will take
approximately 8 minutes; with carbonate, approximately 5.

I lived in Paris for a long time, and had no trouble getting any of
these chemicals. I would assume they're equally available in Italy,
though perhaps in different packaging or under different brand names.
But all are friendly to humans and the environment.

Cheers,
Larry

Beppe Albor=E8 wrote:

=20

hi.
i was reading the safety sheets of some development chemicals products =
for
film and for papers.
in every sheet that i've read, there's always a paragraph like this :

"Irritating to eyes, respiratory system and skin. Limited evidence of a=

carcinogenic effect. May
cause sensitisation by skin contact. Possible risk of irreversible effe=
cts.
Carcinogen Category 3.
Mutagen Category 3."

do you know if it's possible to find safe development products, without=
the
risk of carcinogenic effects ?
i've heard that there are some ecological developers, without a substan=
ce
called "hidroquinone".
do you think these products without hidroquinone can be safe from this
=20

point
=20

of view (i mean, without the risk of carcinogenic effects ) ?

please, let me know, thanks !!!





=20



=20

Beppe Albor=E8 wrote:

Read all about it! Search this NG for, infirmary . Also,
I'm a bad speller, search for, infirmiry . Dan

Beppe Albor=E8 wrote:

Read all about it! Search this NG for, infirmary . Also,
I'm a bad speller, search for, infirmiry . Dan

On Thu, 23 Dec 2004 15:19:15 GMT, "Beppe Alborè"
wrote:

hi.
i was reading the safety sheets of some development chemicals products for
film and for papers.
in every sheet that i've read, there's always a paragraph like this :

"Irritating to eyes, respiratory system and skin. Limited evidence of a
carcinogenic effect. May
cause sensitisation by skin contact. Possible risk of irreversible effects.
Carcinogen Category 3.
Mutagen Category 3."

do you know if it's possible to find safe development products, without the
risk of carcinogenic effects ?
i've heard that there are some ecological developers, without a substance
called "hidroquinone".
do you think these products without hidroquinone can be safe from this point
of view (i mean, without the risk of carcinogenic effects ) ?

please, let me know, thanks !!!




dec2404 from Lloyd Erlick,

It is very easy to avoid bodily contact with any
chemical used in an ordinary darkroom, especially a
black and white darkroom.

I use the single-tray method of working for making FB
prints, and I never have the least touch of chemistry
on my skin, without gloves or skin-protection creams.

Regular darkroom chemicals are used in water solution,
so they will cannot jump out and get you. Sometimes a
gas may be formed, but the gases involved are smelly,
so they are clear when they are present, and they are
not unduly dangerous if ventilation is used. It's easy
to avoid drinking or eating the chemicals, so with all
modes of transport into the body cut off, even
dangerous chemicals couldn't cause harm.

Substances like hydroquinone need not be feared, so
long as one is not breathing hydroquinone powder/dust
or stirring it into one's coffee (bet you couldn't
swallow it anyway!!) Hydroquinone is likely more of a
problem at the manufacturing end where workers must
handle large amounts day after day. A regular darkroom
worker who keeps hands out of the solutions will not be
likely to suffer from contact.

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



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On 12/23/2004 7:19 AM Beppe Alborè spake thus:

i've heard that there are some ecological developers, without a substance
called "hidroquinone".

Speaking of hydroquinone, do y'all realize that this is the chemical agent
thought to be responsible for Michael Jackson's death pallor?

- http://itsb.ucsf.edu/~vcr/Freeze2b.html *
- http://www.snopes.com/photos/jackson.asp
- http://www.robertkotlermd.com/people_news.htm

* actually, they say it's "a cream containing monobenzyl ether of
hydroquinone (also called benoquin)"


--
Today's bull**** job description:

• Collaborate to produce operational procedures for the systems management
of the production Information Technology infrastructure.

- from an actual job listing on Craigslist (http://www.craigslist.org)

On 12/23/2004 7:19 AM Beppe Alborè spake thus:

i've heard that there are some ecological developers, without a substance
called "hidroquinone".

Speaking of hydroquinone, do y'all realize that this is the chemical agent
thought to be responsible for Michael Jackson's death pallor?

- http://itsb.ucsf.edu/~vcr/Freeze2b.html *
- http://www.snopes.com/photos/jackson.asp
- http://www.robertkotlermd.com/people_news.htm

* actually, they say it's "a cream containing monobenzyl ether of
hydroquinone (also called benoquin)"


--
Today's bull**** job description:

• Collaborate to produce operational procedures for the systems management
of the production Information Technology infrastructure.

- from an actual job listing on Craigslist (http://www.craigslist.org)

LR Kalajainen wrote:

Here's a very simple mix-it-yourself formula

6 g. Sodium carbonate
4 g. Vitamin C (ascorbic acid)
4 ml. 1% Phenidone solution
1 liter of water.


Looked like FX-1 so I checked my copy of P. Dignan's
Classic B&W Formulas. An article there by Gerald Koch,
High Acutance Developers, includes a few formulas;
Beutler, FX-1, FX-13, and Mason.
Mason: .5 gram metol, 5 gram sulfite, and 5.85 gram
carbonate. A trace of iodide is indicated but I think
usually ignored.
I found Beutler too active and FX-1 about right with
Pan F+. Mason's is the same as FX-1 save that it has
twice the carbonate.
I'd think your formula more like Mason's. That A.
acid will need the extra carbonate to give more
like FX-1 results.
BTW, is that carbonate the mono or deca hydrate?
Washing soda is the decahydrate. That would make
a big difference. I'd think then your formula
more like FX-1. Dan

LR Kalajainen wrote:

Here's a very simple mix-it-yourself formula

6 g. Sodium carbonate
4 g. Vitamin C (ascorbic acid)
4 ml. 1% Phenidone solution
1 liter of water.


Looked like FX-1 so I checked my copy of P. Dignan's
Classic B&W Formulas. An article there by Gerald Koch,
High Acutance Developers, includes a few formulas;
Beutler, FX-1, FX-13, and Mason.
Mason: .5 gram metol, 5 gram sulfite, and 5.85 gram
carbonate. A trace of iodide is indicated but I think
usually ignored.
I found Beutler too active and FX-1 about right with
Pan F+. Mason's is the same as FX-1 save that it has
twice the carbonate.
I'd think your formula more like Mason's. That A.
acid will need the extra carbonate to give more
like FX-1 results.
BTW, is that carbonate the mono or deca hydrate?
Washing soda is the decahydrate. That would make
a big difference. I'd think then your formula
more like FX-1. Dan

"David Nebenzahl" wrote in message ...
On 12/23/2004 7:19 AM Beppe Alborè spake thus:

i've heard that there are some ecological developers, without a substance
called "hidroquinone".

Speaking of hydroquinone, do y'all realize that this is the chemical agent
thought to be responsible for Michael Jackson's death pallor?

- http://itsb.ucsf.edu/~vcr/Freeze2b.html *
- http://www.snopes.com/photos/jackson.asp
- http://www.robertkotlermd.com/people_news.htm

* actually, they say it's "a cream containing monobenzyl ether of
hydroquinone (also called benoquin)"

Yep, and this was the reason France promulgated a law obliging all photo shops to put the developers
containing hydroquinone in closed cupboards ...

Regards,
--
Claudio Bonavolta
http://www.bonavolta.ch