Josh Lynch on sat 21 aug 99
Someone just gave me a pound of Iron pyrite. 2/3 of it went through
80's seive.
I looked it up in Hamer and Hamer, and Ceramic Spectrum . . .
Does anyone have any experience with this material? It decomposes at
stoneware temperatures, but I thought it might be sparkly-alicious if I
could trap it in a glaze before it totally decomposes.
If anyone has experience with this -- THanks!
Josh in West Virginia.
__________________________________________________
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Bid and sell for free at http://auctions.yahoo.com
Tom Buck on mon 23 aug 99
Josh:
Part 2 - a revision. I finally got to my C&P Handbook and looked
up FeS2... it melts at 1171 oC, not 1300+ oC. It is FeS (nat "troilite")
that melts higher at 1200 oC, and it is the one that decomposes at higher
temperatures, releasing Sulfur and Iron. FeS2 is more stable but once it
goes into the vapour phase it will react with oxygen and form FeO/Fe2O3
and SO2, (as others noted too).
Tom Buck ) tel: 905-389-2339
(westend Lake Ontario, province of Ontario, Canada).
mailing address: 373 East 43rd Street,
Hamilton ON L8T 3E1 Canada
Kenneth D. Westfall on mon 23 aug 99
Fools Gold or Iron pyrite is chemically iron sulfate, if I remember
correctly, and at cone 10 your going to get iron speckles and lots of
sulfur fumes. So iron oxide will give you the same results with out all
the coughing from sulfur fumes.
At 05:28 PM 08/21/1999 EDT, you wrote:
>----------------------------Original message----------------------------
>Someone just gave me a pound of Iron pyrite. 2/3 of it went through
>80's seive.
>
>I looked it up in Hamer and Hamer, and Ceramic Spectrum . . .
>
>Does anyone have any experience with this material? It decomposes at
>stoneware temperatures, but I thought it might be sparkly-alicious if I
>could trap it in a glaze before it totally decomposes.
>
>If anyone has experience with this -- THanks!
>
>Josh in West Virginia.
>__________________________________________________
>Do You Yahoo!?
>Bid and sell for free at http://auctions.yahoo.com
>
Kenneth D. Westfall
Pine Hill Pottery
R.D. #2 Box 6AA
Harrisville, WV 26362
pinehill@ruralnet.org
http://www.ruralnet.org/pinehillpottery
Michael Banks on tue 24 aug 99
Yes, it is technically possible to entrap pyrite grains in a low-melting
(say below 1100 C) reduction glaze. Sulphides are generally imiscible in
silicate melts. The entire firing may have to be conducted in reduction or
an inert atmosphere though (e.g. a saggar filled with nitrogen or CO2), to
prevent oxidation of the pyrite. One could imagine a deep cobalt blue Lapis
Lazuli glaze with pyrite inclusions (natural lapis has gold speckles which
are pyrite).
Some Clayarters in the past have enquired about a source of high purity iron
oxide, some people going to great lengths to acquire this. Blue celedons
and Kaki reds for example, require very low contaminants particularly of
TiO2 or CaO. Because pyrite has very limited substitution by elements other
than iron & sulphur (only rarely traces of Ni, Mn or Co), it can be used to
produce very pure iron oxide. This entails calcining in air to ~1000
degrees C (e.g. bisc kiln in oxidation). Very good ventilation (and no
neighbours!) are necessary to evict sulphur dioxide fumes though. Placing a
thin layer in a a large diameter flat unglazed dish will enable thorough
oxidation.
Michael Banks,
Nelson,
New Zealand
At 05:28 PM 08/21/1999 EDT, you wrote:
>----------------------------Original message----------------------------
>Someone just gave me a pound of Iron pyrite. 2/3 of it went through
>80's seive.
>
>I looked it up in Hamer and Hamer, and Ceramic Spectrum . . .
>
>Does anyone have any experience with this material? It decomposes at
>stoneware temperatures, but I thought it might be sparkly-alicious if I
>could trap it in a glaze before it totally decomposes.
>
>If anyone has experience with this -- THanks!
>
>Josh in West Virginia.
Linda Mccaleb on fri 28 aug 09
=3DA0=3DA0 Dear ClayFolk,=3D0A=3DA0 I'm not sure if you know about fool's g=
old, foo=3D
l's copper and rosy reds.=3DA0 I found out about these through a china pain=
ti=3D
ng web site.=3DA0 They mix with mineral oil, to a slick consistency and the=
y =3D
are dishwasher safe, microwave safe. They come in a powdered form and mix b=
=3D
y grinding with a small pallet knife on a tile or glass. They are striking =
=3D
colors, but the fool's gold is no substitute for the real thing, unless it =
=3D
is on dishes, so you can microwave and put them in the dishwasher. The gold=
=3D
is still beautiful!=3D0A=3DA0 I don' know the web site but you can call Pa=
t Mc=3D
Clendon at318-686-4515.=3DA0 She makes it and it is at a reasonable price. =
Sh=3D
e can give you the web site and you can see some of the pictures of her wor=
=3D
ks.=3D0A=3DA0 Linda=3D0A=3D0A=3D0A
marci and rex on fri 28 aug 09
At 12:05 PM 8/28/2009, Linda Mccaleb wrote:
> Dear ClayFolk, I'm not sure if you know about fool's gold,
> fool's copper and rosy reds. I found out about these through a
> china painting web site. They mix with mineral oil, to a slick
> consistency and they are dishwasher safe, microwave safe. They come
> in a powdered form and mix by grinding with a small pallet knife on
> a tile or glass. They are striking colors, but the fool's gold is
> no substitute for the real thing, unless it is on dishes, so you
> can microwave and put them in the dishwasher. The gold is still
> beautiful! I don' know the web site but you can call Pat
> McClendon at318-686-4515. She makes it and it is at a reasonable
> price. She can give you the web site and you can see some of the
> pictures of her works. Linda
Hi Linda,
The fool's gold, copper and red are metallic chinapaints and ,
really should NOT be
used on food bearing surfaces. The metallic chinapaints all
fire with a satiny textured surface ( like uncapped , fired
dichroic glass ) . They do look pretty though ..
Marci Blattenberger Boskie's Mama =3D^..^=3D
http://www.marciblattenberger.com
marci@ppio.com
Porcelain Painters International Online http://www.ppio.com
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