Wade Blocker on tue 24 jul 01
June,
I would save the pyrites for a tenmoku glaze. two recipes, one from
Michael Casson and one from Harrow call for iron spangles, cone 9-10
reduction. Vanadium makes a nice yellow. Many yellow stains are a mix of
tin and vanadium. Mia in hot ABQ
Joyce Lee on tue 24 jul 01
Evening June...... I do not have the answer about the chems with which you
were
gifted, but "Out of the Earth, Into the Fire"
goes into considerable detail about many
substances/materials which may benefit
potters. Or the Hamers may have some info,
too.
Joyce
In the Mojave
> Just had a load of chemicals donated to us, older ones mostly, but
> nothing happens to Nepheline Syenite, Chrome oxide, cobalt, etc. Hadn't
> seen Kingman Feldspar for years! There are a few lead based frits,
> vanadium etc. which will have to go to hazardous waste, as we won't be
> using those. Two of the jars hold materials with which I am
> unfamiliar. One is Pyrites (I suspect this is an iron of some sort - it
> is a blackish powder) and the other is granular Chromite, shiny black
> grains a little larger than granular rutile. Does anyone have any idea
> what these two chemicals might do?
>
> Thanks.....June from B.C.
>
>
____________________________________________________________________________
__
> Send postings to clayart@lsv.ceramics.org
>
> You may look at the archives for the list or change your subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at
melpots@pclink.com.
Don & June MacDonald on tue 24 jul 01
Just had a load of chemicals donated to us, older ones mostly, but
nothing happens to Nepheline Syenite, Chrome oxide, cobalt, etc. Hadn't
seen Kingman Feldspar for years! There are a few lead based frits,
vanadium etc. which will have to go to hazardous waste, as we won't be
using those. Two of the jars hold materials with which I am
unfamiliar. One is Pyrites (I suspect this is an iron of some sort - it
is a blackish powder) and the other is granular Chromite, shiny black
grains a little larger than granular rutile. Does anyone have any idea
what these two chemicals might do?
Thanks.....June from B.C.
Ababi on wed 25 jul 01
The mottled claybody I used, looks like mottled with manganese, in the
invoice it is written that includes Pyrites
Now from The Magic Of Fire by Tony Hansen:
About Magnetite:
++++++++++++++++
ANALYSIS & UNITY FORMULA
Fe2O3..... 66.17% 1.00
FeO....... 33.83% [ 1.00]
MAGNETITE Notes
Magnetic Iron oxide. Iron scale. Iron spangles.
This is a distinct black, hard, dense and stable crystal-line
mineral form of iron oxide made from magnetite ore.
It is not to be confused with brown Fe 3 O 4 mixed ferrous-ferric
iron oxide.
Unlike the much softer black and red iron oxide, this
material is useful in granular form to introduce specking
into bodies and glazes. As a ground powder it has little
advantage over other forms of iron. Other materials such
as granular manganese, iron pyrites, granular rutile and
ilmenite are also useful for speckling purposes.
About
CHROMITE:
Description: IRON CHROMATE
Date: 09/05/97
Supplier: GENERIC
Cost: 26.94 per 50BG
Raw Weight: 254.43
Family: 8-Colorant
ANALYSIS & UNITY FORMULA
Cr2O3..... 67.85% 0.00
FeO....... 32.40% [ 1.00]
Ababi
---------- Original Message ----------
>Just had a load of chemicals donated to us, older ones mostly, but
>nothing happens to Nepheline Syenite, Chrome oxide, cobalt, etc. Hadn't
>seen Kingman Feldspar for years! There are a few lead based frits,
>vanadium etc. which will have to go to hazardous waste, as we won't be
>using those. Two of the jars hold materials with which I am
>unfamiliar. One is Pyrites (I suspect this is an iron of some sort - it
>is a blackish powder) and the other is granular Chromite, shiny black
>grains a little larger than granular rutile. Does anyone have any idea
>what these two chemicals might do?
>Thanks.....June from B.C.
>________________________________________________________________________
>______
>Send postings to clayart@lsv.ceramics.org
>You may look at the archives for the list or change your subscription
>settings from http://www.ceramics.org/clayart/
>Moderator of the list is Mel Jacobson who may be reached at
>melpots@pclink.com.
scott lykens on wed 25 jul 01
>
>Pyrite, aka fools gold. we use to go nuts for the stuff when i was a child
>growing up in rural PA. It was amish country about an hour from
>philadelphia and we use to take it on field trips to sell to city children.
you might also call it FeS2 47% Fe, 33% S. Its a source for ferrous
sulfate and its major use in ceramic colorants is amber glass. its also
used as filler in resin bonded abrasives and brake linings.
Chromite is where chromium oxide is sourced from. Some folks find it useful
as a refractory. Others might use it like a colorant and i believe its the
color source for green glass bottle. I would assume that its granular
nature tends to produce spotting if used in a glazes
but you know what they say about assumption.
hope that helps.
sct
>
> > Just had a load of chemicals donated to us, older ones mostly, but
> > nothing happens to Nepheline Syenite, Chrome oxide, cobalt, etc. Hadn't
> > seen Kingman Feldspar for years! There are a few lead based frits,
> > vanadium etc. which will have to go to hazardous waste, as we won't be
> > using those. Two of the jars hold materials with which I am
> > unfamiliar. One is Pyrites (I suspect this is an iron of some sort - it
> > is a blackish powder) and the other is granular Chromite, shiny black
> > grains a little larger than granular rutile. Does anyone have any idea
> > what these two chemicals might do?
> >
> > Thanks.....June from B.C.
> >
> >
>____________________________________________________________________________
>__
> > Send postings to clayart@lsv.ceramics.org
> >
> > You may look at the archives for the list or change your subscription
> > settings from http://www.ceramics.org/clayart/
> >
> > Moderator of the list is Mel Jacobson who may be reached at
>melpots@pclink.com.
>
>______________________________________________________________________________
>Send postings to clayart@lsv.ceramics.org
>
>You may look at the archives for the list or change your subscription
>settings from http://www.ceramics.org/clayart/
>
>Moderator of the list is Mel Jacobson who may be reached at
>melpots@pclink.com.
_________________________________________________________________
Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp
Edouard Bastarache on wed 25 jul 01
Hello,
Re: chromite.
ferrous chromite has the following formula, FeO.Cr2O3.
It can also be written as follows,Cr2Fe2O4; molecular weight, 223.85.
It is the principal constituent of many chrome ores.
Later,
Edouard Bastarache
Irreductible Quebecois
Sorel-Tracy
Quebec
edouardb@sorel-tracy.qc.ca
http://sorel-tracy.qc.ca/~edouardb/
http://www.absolutearts.com/portfolios/e/edouardb/
----- Original Message -----
From: scott lykens
To:
Sent: Wednesday, July 25, 2001 10:02 AM
Subject: Re: unusual chemicals
> >
> >Pyrite, aka fools gold. we use to go nuts for the stuff when i was a
child
> >growing up in rural PA. It was amish country about an hour from
> >philadelphia and we use to take it on field trips to sell to city
children.
>
> you might also call it FeS2 47% Fe, 33% S. Its a source for ferrous
> sulfate and its major use in ceramic colorants is amber glass. its also
> used as filler in resin bonded abrasives and brake linings.
>
> Chromite is where chromium oxide is sourced from. Some folks find it
useful
> as a refractory. Others might use it like a colorant and i believe its the
> color source for green glass bottle. I would assume that its granular
> nature tends to produce spotting if used in a glazes
> but you know what they say about assumption.
>
> hope that helps.
> sct
> >
> > > Just had a load of chemicals donated to us, older ones mostly, but
> > > nothing happens to Nepheline Syenite, Chrome oxide, cobalt, etc.
Hadn't
> > > seen Kingman Feldspar for years! There are a few lead based frits,
> > > vanadium etc. which will have to go to hazardous waste, as we won't be
> > > using those. Two of the jars hold materials with which I am
> > > unfamiliar. One is Pyrites (I suspect this is an iron of some sort -
it
> > > is a blackish powder) and the other is granular Chromite, shiny black
> > > grains a little larger than granular rutile. Does anyone have any
idea
> > > what these two chemicals might do?
> > >
> > > Thanks.....June from B.C.
> > >
> > >
>
>___________________________________________________________________________
_
> >__
> > > Send postings to clayart@lsv.ceramics.org
> > >
> > > You may look at the archives for the list or change your subscription
> > > settings from http://www.ceramics.org/clayart/
> > >
> > > Moderator of the list is Mel Jacobson who may be reached at
> >melpots@pclink.com.
> >
>
>___________________________________________________________________________
___
> >Send postings to clayart@lsv.ceramics.org
> >
> >You may look at the archives for the list or change your subscription
> >settings from http://www.ceramics.org/clayart/
> >
> >Moderator of the list is Mel Jacobson who may be reached at
> >melpots@pclink.com.
>
>
> _________________________________________________________________
> Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp
>
>
____________________________________________________________________________
__
> Send postings to clayart@lsv.ceramics.org
>
> You may look at the archives for the list or change your subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at
melpots@pclink.com.
iandol on fri 27 jul 01
Iron Pyrites is a sulphide mineral Fe2S, often referred to as "Fools =
Gold" because of its brilliant golden yellow colour. This unfortunately =
turns to black when ground to a powder. Separates and washes out when =
panning before true Gold
KEEP AWAY FROM ACID.
This chemical evolves Hydrogen sulphide when in contact with acid =
(Including I would suspect Uric Acid since this gas is associated with =
the disposal of pig manure and other sewage products). Hydrogen sulphide =
is POISONOUS, but has the insidious effect of being an anaesthetic to =
the organs of scent at the parts per million level. Smells like rotten =
eggs until your nose goes to sleep. Then you "Cark It" if you continue =
to breath the stuff.
Some natural clays may have a proportion of iron pyrites in their =
mineral content.
In the kiln it will possibly evolve either or both Sulphur dioxide and =
Sulphur trioxide. Both are corrosive gases. Bronchial irritants when =
inhaled is my personal experience.
I can see no valid use for this chemical in a pottery of studio.
Best regards,
Ivor Lewis. Redhill, South Australia=20
| |
|
