[pure-silver] Re: "Green" Developer
- From: "BOB KISS" <bobkiss@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Mon, 30 Nov 2009 18:56:58 -0400
DEAR NICHOLAS ET ALIA,
The oxidized pyro developer we dump down the drain may very well
have little environmental impact but I cannot accept, " Pyro's toxicity is
really overblown."
Please read all of page 59 of the second printing of THE BOOK OF
PYRO by Gordon Hutchings. The second half of the page titled "CHEMICAL
EFFECTS ON THE BODY" (of pyro) cites a number of studies supporting a number
of pyro's deleterious effects on the nervous system as well as evidence that
it may be mutagenic and carcinogenic.
I, for one, will always err on the side of caution...I use gloves
whenever using the dev and a respirator when mixing the powder.
All I have to say to anyone who is cavalier about pyro, "It's your
funeral!" sooner or later!
CHEERS!
BOB
-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Nicholas O. Lindan
Sent: Sunday, November 29, 2009 3:31 PM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: "Green" Developer
> And which would be considered the least environmentally friendly? A
> Pyro variant?
Pyro is probably the most environmental of the lot...
Gallic acid comes from oak galls - produced by
oak trees to fight off parasites. Boiling the
galls gives you pyrogallol. Got an oak tree in
the yard?
The other ingredients are in smaller proportion than in any
other developer. Per liter:
PMK D-76
Metol 0.05 2.00
Pyro/HQ 0.50 5.00
Sulfites 0.10 100.00
Borates 6.00 16.00
Though 1 liter of D-76 will develop more film than a liter
of PMK, it isn't anywhere in proportion to ingredient
quantity.
Pyro's toxicity is really overblown. The LD50 (rat) is
around 1200 mg/kg. Compare that to table salt at 3000 mg/kg.
Yes it is an irritant - it is supposed to be irritating -
that was the oak tree's intent when it made the stuff.
Contact with skin? Try this:
http://www.henriettesherbal.com/eclectic/bpc1911/acidum-pyro.html
Not in current use, but still in the pharmacopoeia.
Catechol? Better become a beef eater if you want to avoid it...
http://www.ehow.com/about_4619323_catechol-in-bananas.html
http://en.wikipedia.org/wiki/Catechol
==
Nicholas O. Lindan
Cleveland Engineering Design, LLC
Cleveland, Ohio 44121
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