Source for paraphenylene diamine (base)

I'd like to try mixing my own 777 developer which requires paraphenylene
diamine (base), but I can't find anywhere to buy it. Can anyone help?

-Lew S

Lew wrote:
I'd like to try mixing my own 777 developer which requires paraphenylene
diamine (base), but I can't find anywhere to buy it. Can anyone help?



Try this

http://www.photoformulary.com/DesktopDefault.aspx

Cheers,

Scott.

Hi !

You can try at Sigma-Aldrich Chemical company.

Great quality, all the products for organic chemistry or research.

Cheers !

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Lew wrote:
I'd like to try mixing my own 777 developer which requires
paraphenylene
diamine (base), but I can't find anywhere to buy it. Can anyone help?

-Lew S

That agent gives poor sharpness. Don't waste your time.

UC wrote:
Lew wrote:

I'd like to try mixing my own 777 developer which requires
paraphenylenediamine (base), but I can't find anywhere to buy it. Can anyone help?


-Lew S


That agent gives poor sharpness. Don't waste your time.

It was well known for giving fine grain in the negatives of the day
(1930s? 1940s?), probably because of its solvent action on the silver
grains. Of course there would be an acutance penalty for that (might as
well use D-25?) that probably did not matter as much with 4x5" and 120
size film as it would with 35mm. Also, there tended to be about a 2-stop
speed loss.

Since these days you can buy pretty fine grain film, and with small
negatives you need (for most images) all the acutance you can get, you may
not want to deal with paraphenylenediamine anyway or any solvent develper
for that matter.

It also has a reputation for being carcinogenic. Derivatives are used in
color developers, but they are typically loaded with long hydrocarbon
chains to make them less soluble in in things such as human skin. Even if
they are not carcinogenic, they are irritating.

The reputation that Metol has for being allergenic is mostly (not
entirely) due to ppd impurities in it as a result of the early
manufacturing process. Ppd does not seem to be a common impurity in it
these days. But people can be found who are allergic or sensitive to just
about anything.

--
.~. Jean-David Beyer Registered Linux User 85642.
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^^-^^ 09:35:00 up 49 days, 17:52, 3 users, load average: 4.09, 4.17, 4.17

Jean-David Beyer wrote:
UC wrote:

Lew wrote:

I'd like to try mixing my own 777 developer which requires

paraphenylenediamine (base), but I can't find anywhere to buy it. Can
anyone help?



-Lew S



That agent gives poor sharpness. Don't waste your time.

It was well known for giving fine grain in the negatives of the day
(1930s? 1940s?), probably because of its solvent action on the silver
grains. Of course there would be an acutance penalty for that (might as
well use D-25?) that probably did not matter as much with 4x5" and 120
size film as it would with 35mm. Also, there tended to be about a 2-stop
speed loss.

Since these days you can buy pretty fine grain film, and with small
negatives you need (for most images) all the acutance you can get, you may
not want to deal with paraphenylenediamine anyway or any solvent
develper for that matter.

It also has a reputation for being carcinogenic. Derivatives are used in
color developers, but they are typically loaded with long hydrocarbon
chains to make them less soluble in in things such as human skin. Even if
they are not carcinogenic, they are irritating.

The reputation that Metol has for being allergenic is mostly (not
entirely) due to ppd impurities in it as a result of the early
manufacturing process. Ppd does not seem to be a common impurity in it
these days. But people can be found who are allergic or sensitive to just
about anything.


Yep, just do a google search on the chemical name and see what you
get... probably 90% allergy and 'this stuff is bad' articles.

Scott.

On Thu, 10 Mar 2005 09:47:05 -0500, Jean-David Beyer
wrote:

UC wrote:
Lew wrote:

I'd like to try mixing my own 777 developer which requires
paraphenylenediamine (base), but I can't find anywhere to buy it. Can anyone help?


-Lew S


That agent gives poor sharpness. Don't waste your time.

It was well known for giving fine grain in the negatives of the day
(1930s? 1940s?), probably because of its solvent action on the silver
grains. Of course there would be an acutance penalty for that (might as
well use D-25?) that probably did not matter as much with 4x5" and 120
size film as it would with 35mm. Also, there tended to be about a 2-stop
speed loss.

Since these days you can buy pretty fine grain film, and with small
negatives you need (for most images) all the acutance you can get, you may
not want to deal with paraphenylenediamine anyway or any solvent develper
for that matter.

It also has a reputation for being carcinogenic. Derivatives are used in
color developers, but they are typically loaded with long hydrocarbon
chains to make them less soluble in in things such as human skin. Even if
they are not carcinogenic, they are irritating.

The reputation that Metol has for being allergenic is mostly (not
entirely) due to ppd impurities in it as a result of the early
manufacturing process. Ppd does not seem to be a common impurity in it
these days. But people can be found who are allergic or sensitive to just
about anyting.

Yep, iwas allergic to Metol, but after massive overexposure, I was
left allergic to my own sweat.

I used PPD a number of times and found no problems with loss of
sharpness. I also used modern PPD derivatrives while experimenting
with Sease formulations. I got higher speed, improved grain and
sharpness, after including Phenidone.

Keep plugging away and experimenting. The radioactive one doesn't
have the last word. He' stuck in a time warp.

Robert Vervoordt, MFA

On photonet, someone did a test and the sharpness loss was quite
noticeable.


Robert Vervoordt wrote:
On Thu, 10 Mar 2005 09:47:05 -0500, Jean-David Beyer
wrote:

UC wrote:
Lew wrote:

I'd like to try mixing my own 777 developer which requires
paraphenylenediamine (base), but I can't find anywhere to buy it.
Can anyone help?


-Lew S


That agent gives poor sharpness. Don't waste your time.

It was well known for giving fine grain in the negatives of the day
(1930s? 1940s?), probably because of its solvent action on the
silver
grains. Of course there would be an acutance penalty for that (might
as
well use D-25?) that probably did not matter as much with 4x5" and
120
size film as it would with 35mm. Also, there tended to be about a
2-stop
speed loss.

Since these days you can buy pretty fine grain film, and with small
negatives you need (for most images) all the acutance you can get,
you may
not want to deal with paraphenylenediamine anyway or any solvent
develper
for that matter.

It also has a reputation for being carcinogenic. Derivatives are
used in
color developers, but they are typically loaded with long
hydrocarbon
chains to make them less soluble in in things such as human skin.
Even if
they are not carcinogenic, they are irritating.

The reputation that Metol has for being allergenic is mostly (not
entirely) due to ppd impurities in it as a result of the early
manufacturing process. Ppd does not seem to be a common impurity in
it
these days. But people can be found who are allergic or sensitive to
just
about anyting.

Yep, iwas allergic to Metol, but after massive overexposure, I was
left allergic to my own sweat.

I used PPD a number of times and found no problems with loss of
sharpness. I also used modern PPD derivatrives while experimenting
with Sease formulations. I got higher speed, improved grain and
sharpness, after including Phenidone.

Keep plugging away and experimenting. The radioactive one doesn't
have the last word. He' stuck in a time warp.

Robert Vervoordt, MFA

Dear Sirs,
we are the largest manufacturer of para phenylene diamine in India.kindly
inform us your requirment.please inform us the quantity and specifications
required for your end use.we would certinly assist you by all the possible
ways.
looking forward to your reply.
regards.

--
Message posted via http://www.photokb.com

Dear Sirs,
we are the largest manufacturer of para phenylene diamine in India.kindly
inform us your requirment.please inform us the quantity and specifications
required for your end use.we would certinly assist you by all the possible
ways.
looking forward to your reply.
regards.

--
Message posted via http://www.photokb.com