Sally Guger on thu 21 feb 08
Hi Alisa, (not Alias!!)
Thanks for the explanation- I know I've used manganese infrequently over the years-but I took out a very old container of something that had chunks of brown stuff almost like bark- I need to go back and see which chemical it was. Then I noticed very light fluffy stuff when I bought out a women's total collection of chemicals (must have been magnesium carb). I'm always careful about handling anything- when I'm here at home in the evening corresponding with Clayarters-I don't have the chemicals in front of me. I'll have to check out the labels when I'm back at the studio. I don't think I have a use for the 20 lbs. of magnesium carb-light.
Again, I appreciate the input from several people- I know I could have looked it up-but it's nice to "hear" it explained! Regards-Sally
Alisa Clausen wrote:
> Could someone tell me the difference between magnesium and manganese? I
have some of both. Thanks. Sally
>
>
Hi Sally
Good you asked because these are two materials you will come across often
in your glaze making.
Hamer and Hamer is such a good resource and I warmly and highly recommend
that you buy or borrow a copy. It has so much information and you will be
so rewarded with knowledge when you get into your studio.
A short paraphrase from Hamer and Hamer
Manganese Oxide (also found as a Carbonate)
MnO or Mno2
Metal oxide used a to color clay bodies and glazes. Can give black, brown
and purple. Can occur in clay but in most cases is added.
Over 15% will flux stoneware slips to a slip glaze. Oversaturation with
20% can give metallic surfaces in glazes. Highly hazardous in powder form
and extreme caution and protective mask and gloves must be used when
handling.
-----------------------
Magnesium Oxide, also found as Carbonate. MgO, MgCO3
Magnesium oxide is highly refractory and is an opacifier in glazes up to
1170c (2138f) when it becomes an active flux.
A material that both found in clay bodies and glazes.
Magnesium, often sourced from Dolomite, gives lilacs in glazes with added
Cobalt. Magnesium is in Magnesium mats, as it is extremely refractory is
can be added for crawling effects and over gloss glazes, gives lizard
effect.
This is a very interesting material with a wide range of effects and worth
reading up on.
But that is the short, short version just to illustrate that there these
materials are vastly different from each other, both with their own
interesting characteristics worth exploring.
Best regards,
Aisa in Denmark
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Live, Give, Love
Beyond All Expectation.
Sally Guger
Lakespur Blue Pottery & Sculpture
Lodi, Wisconsin, USA
http://www.saukpr.k12.wi.us/~gugersa/the_art_teachers.htm
---------------------------------
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Alisa Clausen on thu 21 feb 08
> Could someone tell me the difference between magnesium and manganese? I
have some of both. Thanks. Sally
>
>
Hi Sally
Good you asked because these are two materials you will come across often
in your glaze making.
Hamer and Hamer is such a good resource and I warmly and highly recommend
that you buy or borrow a copy. It has so much information and you will be
so rewarded with knowledge when you get into your studio.
A short paraphrase from Hamer and Hamer
Manganese Oxide (also found as a Carbonate)
MnO or Mno2
Metal oxide used a to color clay bodies and glazes. Can give black, brown
and purple. Can occur in clay but in most cases is added.
Over 15% will flux stoneware slips to a slip glaze. Oversaturation with
20% can give metallic surfaces in glazes. Highly hazardous in powder form
and extreme caution and protective mask and gloves must be used when
handling.
-----------------------
Magnesium Oxide, also found as Carbonate. MgO, MgCO3
Magnesium oxide is highly refractory and is an opacifier in glazes up to
1170c (2138f) when it becomes an active flux.
A material that both found in clay bodies and glazes.
Magnesium, often sourced from Dolomite, gives lilacs in glazes with added
Cobalt. Magnesium is in Magnesium mats, as it is extremely refractory is
can be added for crawling effects and over gloss glazes, gives lizard
effect.
This is a very interesting material with a wide range of effects and worth
reading up on.
But that is the short, short version just to illustrate that there these
materials are vastly different from each other, both with their own
interesting characteristics worth exploring.
Best regards,
Aisa in Denmark
steve graber on sun 24 feb 08
Magnesium Carbonate is also the white powder used in gymnastics to keep your hands from sweating too much. if you have any you don't want. take it to your local gyms. they can use it.
it's also great underarm stuff...
see ya
Steve Graber, Graber's Pottery, Inc
Claremont, California USA
The Steve Tool - for awesum texture on pots!
www.graberspottery.com steve@graberspottery.com
----- Original Message ----
From: Sally Guger
To: CLAYART@LSV.CERAMICS.ORG
Sent: Thursday, February 21, 2008 7:49:19 PM
Subject: Re: Manganese vs Magnesim, Sally
Hi Alisa, (not Alias!!)
Thanks for the explanation- I know I've used manganese infrequently over the years-but I took out a very old container of something that had chunks of brown stuff almost like bark- I need to go back and see which chemical it was. Then I noticed very light fluffy stuff when I bought out a women's total collection of chemicals (must have been magnesium carb). I'm always careful about handling anything- when I'm here at home in the evening corresponding with Clayarters-I don't have the chemicals in front of me. I'll have to check out the labels when I'm back at the studio. I don't think I have a use for the 20 lbs. of magnesium carb-light.
Again, I appreciate the input from several people- I know I could have looked it up-but it's nice to "hear" it explained! Regards-Sally
Alisa Clausen wrote:
> Could someone tell me the difference between magnesium and manganese? I
have some of both. Thanks. Sally
>
>
Hi Sally
Good you asked because these are two materials you will come across often
in your glaze making.
Hamer and Hamer is such a good resource and I warmly and highly recommend
that you buy or borrow a copy. It has so much information and you will be
so rewarded with knowledge when you get into your studio.
A short paraphrase from Hamer and Hamer
Manganese Oxide (also found as a Carbonate)
MnO or Mno2
Metal oxide used a to color clay bodies and glazes. Can give black, brown
and purple. Can occur in clay but in most cases is added.
Over 15% will flux stoneware slips to a slip glaze. Oversaturation with
20% can give metallic surfaces in glazes. Highly hazardous in powder form
and extreme caution and protective mask and gloves must be used when
handling.
-----------------------
Magnesium Oxide, also found as Carbonate. MgO, MgCO3
Magnesium oxide is highly refractory and is an opacifier in glazes up to
1170c (2138f) when it becomes an active flux.
A material that both found in clay bodies and glazes.
Magnesium, often sourced from Dolomite, gives lilacs in glazes with added
Cobalt. Magnesium is in Magnesium mats, as it is extremely refractory is
can be added for crawling effects and over gloss glazes, gives lizard
effect.
This is a very interesting material with a wide range of effects and worth
reading up on.
But that is the short, short version just to illustrate that there these
materials are vastly different from each other, both with their own
interesting characteristics worth exploring.
Best regards,
Aisa in Denmark
______________________________________________________________________________
Clayart members may send postings to: clayart@lsv.ceramics.org
You may look at the archives for the list, post messages, change your
subscription settings or unsubscribe/leave the list here: http://www.acers.org/cic/clayart/
Moderator of the list is Mel Jacobson who may be reached at melpots2@visi.com
Live, Give, Love
Beyond All Expectation.
Sally Guger
Lakespur Blue Pottery & Sculpture
Lodi, Wisconsin, USA
http://www.saukpr.k12.wi.us/~gugersa/the_art_teachers.htm
---------------------------------
Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now.
______________________________________________________________________________
Clayart members may send postings to: clayart@lsv.ceramics.org
You may look at the archives for the list, post messages, change your
subscription settings or unsubscribe/leave the list here: http://www.acers.org/cic/clayart/
Moderator of the list is Mel Jacobson who may be reached at melpots2@visi.com
____________________________________________________________________________________
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