Timothy Joko-Veltman on wed 20 feb 08
was Re: Can I get a purple glaze from manganese? (^6 ox)
Sally,
Magnesium oxide (MgO) is an alkaline earth oxide (the lightest of all
of them), and a flux. Manganese oxide or dioxide (MnO and MnO2,
respectively) is a transition metal oxide, and used as a colorant - it
tends to flux glazes a little, and is sometimes used to produce
metallic effects. MgO is supplied by such things as dolomite (a
mineral mixture of calcium carbonate and magnesium carbonate), light
magnesium carbonate (MgCO3, synthetically precipitated - fluffy and
white), and magnesite (mineral magnesium carbonate - white, but
dense). MnO2 is more commonly used than MnO, and is a slightly
brownish or purplish black (MnO is green), and rather dense.
Regards,
Tim
On Feb 20, 2008 2:14 AM, Sally Guger wrote:
> I've only used my 200 gram sample of this glaze -but it's a very nice satin matt deep purple color- seemed to be a good fit on white or a dark tan clay. I probably found it in the archives- don't know what RR thinks of it, I hope its food safe. I use pre-'99 GB.
> Could someone tell me the difference between magnesium and manganese? I have some of both. Thanks. Sally
>
> Semi-gloss Eggplant
> 45.7 Soda Feldspar
> 15.2 Flint
> 12.7 Talc
> 12.9 Gerstley Borate
> 9.0 Dolomite
> 4.5 EPK
>
> Add:
> 1.0 Bentonite
> 2.0 Cobalt Carbonate
> 5.0 Manganese Carbonate
>
>
>
>
>
>
> 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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