rividich@ix.netcom.com on mon 14 oct 96
Please forward any information on magnesium carbonate, glaze results, or experim
compound. Also any other compounds relating to it or displaying the same effect
scientific data related to this compound.
Thanks,
Jan
Paul Monaghan on tue 15 oct 96
rividich@ix.netcom.com wrote:
>
> ----------------------------Original message----------------------------
> Please forward any information on magnesium carbonate, glaze results, or exper
> compound. Also any other compounds relating to it or displaying the same effe
> scientific data related to this compound.
>
> Thanks,
> Jan
Hi Jan,
If you have web access go to the Altavista.com search engine and type in
Magnesium Carbonate. There are 3000 matches which you can browse
through. These don't even begin to address all the data in glaze bases
and opical uses. I hope this helps but I couldn't download that much
data. If you don't have web access I may be able to pull a few down for
you. let me know.
Paul Monaghan
paul@web2u.com
rividich@ix.netcom.com on sun 20 oct 96
Paul, Thanks I would appreciate any info you could download. I need the
effects of mag. carb. ... >-------------------------
jan
---Original message----------------------------
>rividich@ix.netcom.com wrote:
>>
>> ----------------------------Original message----------------------------
>> Please forward any information on magnesium carbonate, glaze results, or
exper
>> compound. Also any other compounds relating to it or displaying the same
effe
>> scientific data related to this compound.
>>
>> Thanks,
>> Jan
>
>
>Hi Jan,
>
>If you have web access go to the Altavista.com search engine and type in
>Magnesium Carbonate. There are 3000 matches which you can browse
>through. These don't even begin to address all the data in glaze bases
>and opical uses. I hope this helps but I couldn't download that much
>data. If you don't have web access I may be able to pull a few down for
>you. let me know.
>
>Paul Monaghan
>paul@web2u.com
>
>
"Rafael Molina-Rodriguez (Rafael Molina-Rodriguez)" on fri 25 oct 96
Jan:
Try the following recipe:
Ball Crawl Cone 6 ( Cone 7 in sitter)
Magnesium Carbonate 50
Nepheline Syenite 50
Interesting lichen-like texture. You may want to try over or under other
glazes. I didn't have much luck with that technique, but it may have been
the glazes I was using. Good Luck!
Rafael
Rmr3431@dcccd.edu
lili krakowski on sun 14 dec 03
Magnesium carbonate is just that. Adding it to a glaze provides =
magnesium. I cannot locate the info right now (cannot lift books etc) =
but the shrinkage of magnesium carb is huge--its use can lead to =
crazing. =20
lili
Paul Lewing on mon 15 dec 03
on 12/14/03 4:15 PM, lili krakowski at mlkrakowski@CITLINK.NET wrote:
> but the shrinkage of magnesium carb is huge--its use can lead to =
> crazing.
I think Lili misspoke here, unlike her usual dead-on advice (which I always
read, by the way). The shrinkage (in drying) of magnesium carbonate is
indeed huge. But that leads to crawling, not crazing. On the other hand,
the coefficient of expansion on magnesium oxide, the chemical that is left
in the fired glaze after the carbonate burns out, is quite low, and actually
helps prevent crazing.
Paul Lewing, Seattle
Edouard Bastarache Inc. on sat 6 oct 07
Smart.Conseil's take on magnesite :
Be careful, MgCO3 is a very light and very fine white powder, it absorbs =
lots of water which can cause crackling of the glaze at the time of =
drying.=20
A bag of 25 kg MgCO3 is 5 times larger than a bag of 25 kg of talc... =
Generally this compound is used as an additive (1 to 2%) to suspend and =
make the baths of glazes more homogeneous, but it is not an ingredient =
used to bring magnesium into the recipes. It is to better use talc or =
dolomite. MgCO3 breaks up below 900=B0C, in glazes of low temperature, =
it can produce important boiling (it has to be avoided in glazes =
containing lead).
Gis la revido,
(A la revoyure)
Edouard Bastarache
Spertesperantisto
Sorel-Tracy
Quebec
http://perso.orange.fr/smart2000/livres.htm
http://www.pshcanada.com/Toxicology.htm
http://www.ceramique.com/librairie/
http://www.flickr.com/photos/30058682@N00/
http://myblogsmesblogs.blogspot.com/
Timothy Joko-Veltman on sat 6 oct 07
Good advice. However, magnesite and Light Magnesium Carbonate are not
the same thing. Magnesite is a mineral of the ideal formula MgCO3,
while light magnesium carbonate is a precipitated material of the same
formula.
Regards,
Tim
On 10/6/07, Edouard Bastarache Inc. wrote:
> Smart.Conseil's take on magnesite :
>
>
>
>
>
> Be careful, MgCO3 is a very light and very fine white powder, it absorbs =
lots of water which can cause crackling of the glaze at the time of drying.
>
> A bag of 25 kg MgCO3 is 5 times larger than a bag of 25 kg of talc... Gen=
erally this compound is used as an additive (1 to 2%) to suspend and make t=
he baths of glazes more homogeneous, but it is not an ingredient used to br=
ing magnesium into the recipes. It is to better use talc or dolomite. MgCO3=
breaks up below 900=B0C, in glazes of low temperature, it can produce impo=
rtant boiling (it has to be avoided in glazes containing lead).
>
>
>
>
>
> Gis la revido,
> (A la revoyure)
>
> Edouard Bastarache
> Spertesperantisto
>
> Sorel-Tracy
> Quebec
> http://perso.orange.fr/smart2000/livres.htm
> http://www.pshcanada.com/Toxicology.htm
> http://www.ceramique.com/librairie/
> http://www.flickr.com/photos/30058682@N00/
> http://myblogsmesblogs.blogspot.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 melpots2@visi=
.com
>
Bill Merrill on sat 6 oct 07
One of the things magnesium carbonate does is shrink. If you have a =
fair amount of MC in your glaze, it can crawl or shrink off the bisque =
ware. I use 35% MC in a glaze with feldspar alone and it does beautiful =
things. It is difficult to handle and it is probably better to use =
other sources for magnesium. I have developed 11 MC crackle surfaces =
from satin mat to a very dry mat surface. I use the glaze over other =
glazes and by itself. Bob Sperry of Seattle used similar very dry =
surfaces when he was alive. I'm not saying don't use Mag Carb, just be =
aware of it's properties and idiosyncrasies. =20
Bill
-----Original Message-----
From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG] On Behalf Of Edouard =
Bastarache Inc.
Sent: Saturday, October 06, 2007 6:28 AM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Magnesium carbonate
Smart.Conseil's take on magnesite :
Be careful, MgCO3 is a very light and very fine white powder, it absorbs =
lots of water which can cause crackling of the glaze at the time of =
drying.=20
A bag of 25 kg MgCO3 is 5 times larger than a bag of 25 kg of talc... =
Generally this compound is used as an additive (1 to 2%) to suspend and =
make the baths of glazes more homogeneous, but it is not an ingredient =
used to bring magnesium into the recipes. It is to better use talc or =
dolomite. MgCO3 breaks up below 900=B0C, in glazes of low temperature, =
it can produce important boiling (it has to be avoided in glazes =
containing lead).
Gis la revido,
(A la revoyure)
Edouard Bastarache
Spertesperantisto
Sorel-Tracy
Quebec
http://perso.orange.fr/smart2000/livres.htm
http://www.pshcanada.com/Toxicology.htm
http://www.ceramique.com/librairie/
http://www.flickr.com/photos/30058682@N00/
http://myblogsmesblogs.blogspot.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 =
melpots2@visi.com
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