John Britt on tue 20 jan 04
Calcium Carbonate is Whiting and I imagine black iron would substitute for
granular magnetite. Not sure about the granular magnetite they may want
granular ilmenite?
Hope that helps,
John Britt
Paul Herman on tue 20 jan 04
Howdy Wayne,
I can tell you need a Hamer and Hamer's Potter's Dictionary, calcium
carbonate is "whiting", limestone, seashells, etc. Your pottery
supplier, is well, deficient to a fault.
You could grind up some seashells, don't you have plenty of those down
there?
Good mixing,
Paul Herman
Great Basin Pottery
Doyle, California US
http://www.greatbasinpottery.com/
----------
>From: wayneinkeywest
> Ran across a glaze recipe calling for
> "calcium carbonate". My pottery
> supplier doesn't carry it.
Susie Schreiber on tue 20 jan 04
Calcium carbonate is the same as whiting (basically ground limestone).
Magnetite is an oxide of iron, and used as a glaze specking agent. Granular
magnetite would just be a coarse form of it as opposed to finely ground.
Both should be readily available. . .
Susie
----- Original Message -----
From: "wayneinkeywest"
To:
Sent: Tuesday, January 20, 2004 5:06 PM
Subject: GLAZE: Unknown substance
Ran across a glaze recipe calling for
"calcium carbonate". My pottery
supplier doesn't carry it.
Came upon another recipe calling for
"granular magnetite". Again, not
carried by my supplier.
Isn't calcium carbonate the stuff
they put in water absorption products?
I think my janitorial supplier
sells it in 50# bags...but I haven't a
clue about the magnetite.
Anyone?
TIA
Wayne Seidl
Fredrick Paget on tue 20 jan 04
>Ran across a glaze recipe calling for=20
>"calcium carbonate". My pottery=20
>supplier doesn't carry it.
>
>Came upon another recipe calling for=20
>"granular magnetite". Again, not=20
>carried by my supplier.
>Wayne Seidl
>
Calcium carbonate is called whiting.
Magnetite is an iron oxide.
Fred
--
From Fred Paget, Marin County, California, USA
fredrick@well.com
wayneinkeywest on tue 20 jan 04
Ran across a glaze recipe calling for=20
"calcium carbonate". My pottery=20
supplier doesn't carry it.
Came upon another recipe calling for=20
"granular magnetite". Again, not=20
carried by my supplier.
Isn't calcium carbonate the stuff=20
they put in water absorption products? =20
I think my janitorial supplier=20
sells it in 50# bags...but I haven't a=20
clue about the magnetite.
Anyone?
TIA
Wayne Seidl
Carol Tripp on wed 21 jan 04
Hi Wayne,
Have a look in your Hamer and Hamer and you will see "Calicum carbonate is
the chemical name. The potter's materials which are almost pure calcium
carbonate are whiting, limestone, marble and chalk."
Is you face red? ;-)
See Hamer for magnetite; "loadstone, lodestone, magnetic ore (Fe3O4) It is
a heavy black ore and one of the few that respond to a magnet. It is in a
crystal or micro-crystalline form and difficult to grind." and so on. "It
is sold under various names such as black magnetic oxide, magnetic iron
oxide, etc." Ah ha, we are back at iron oxide again.
Good luck in your studies. Are you gearing up to order glaze chemicals?
Best regards,
Carol
Dubai, UAE
Wayne wrote, in part>
>Ran across a glaze recipe calling for
>"calcium carbonate". My pottery
>supplier doesn't carry it.
>
>Came upon another recipe calling for
>"granular magnetite". Again, not
>carried by my supplier.
>
_________________________________________________________________
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wayneinkeywest on wed 21 jan 04
Thanks to everyone who replied.
I have taken my Hamer & Hamer and tied it around my neck. No more than I
deserve.
It will be the first place I look in the future, instead of overlook.
Sheepishly,
Wayne Seidl
steve harrison on wed 21 jan 04
Hi Wayne,
Calcium Carbonate is CaCO3 or 'Whiting' or 'calcite', or 'Limestone' or
'chalk' or 'Paris white' or 'Iceland spar' or even 'calc spar', even
ground marble.
With regard to the 'magntite' do you perhaps mean 'magnesite' which is
very closely related to the above, except that it is MgCO3 or
magnesium carbonate.
If you really mean 'magnetite' , then that is brown iron oxide Fe3O4 .
So granular iron oxide is what you want. Try scraping some rust flakes
off a nearby car in a sunny and salty downtown Florida Keys wreckers
yard. Then grinding them to perfection in a mortar and pestle.
I'm sure your supplier does carry these. Its just by a different name.
Try some of the above.
I'm sure one of them will be in stock.
Best wishes
Steve Harrison
Hot & Sticky Pty Ltd
5 Railway Pde
Balmoral Village
NSW 2571
Australia
http://ian.currie.to/sh/Steve_Harrisons_books.html
On Wednesday, January 21, 2004, at 12:06 PM, wayneinkeywest wrote:
> Ran across a glaze recipe calling for
> "calcium carbonate". My pottery
> supplier doesn't carry it.
>
> Came upon another recipe calling for
> "granular magnetite". Again, not
> carried by my supplier.
>
> Isn't calcium carbonate the stuff
> they put in water absorption products?
> I think my janitorial supplier
> sells it in 50# bags...but I haven't a
> clue about the magnetite.
>
> Anyone?
> TIA
> Wayne Seidl
>
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