Edouard Bastarache Inc. on fri 9 jun 06
Dolomite glazes, pictures and recipes at :
http://lapoterie.blogspot.com/
Later,
Edouard Bastarache
Membre de La French Connection
Member of The French Connection
Sorel-Tracy
Quebec
edouardb@sorel-tracy.qc.ca
www.sorel-tracy.qc.ca/~edouardb/Welcome.html
http://perso.wanadoo.fr/smart2000/index.htm
http://www.flickr.com/photos/potier/
http://oldringer.blogspot.com/
http://albertpeintures.blogspot.com/
Lili Krakowski on wed 27 sep 06
Here are few dolomite glazes, as promised
DeBoos 1 (adapted from a c.10 Janet De Boos glaze]
Neph Sy 35.3
Ball Clay OM4 29.4
Dolomite 29.4
Flint 5.9
Alissa Clausen (from a T Martens glaze)
Neph Sy 49
Dolomite 25
Wollastonite 6
Ball Clay 20
Cooper Mottled White
Feldspar 40
Whiting 5
Dolomite 40
Ball Clay 10
Flint 5
The analyses of these glazes was posted along with the recipes in Part III
of About Recipes, to be found in the Archives for the 2nd week of May 2006.
All three a low in silica, and the Clausen is low in alumina.
Cooper 218 goes like this:
Potash Spar 36
Whiting 9
Dolomite 22
Bentonite 5
Flint 28
(Rutile 10)
Na2O .049
K2O .098
MgO .289
CaO .565
Al2O3 .177
SiO2 2.228
Helen Mackensie [adapted?]
Strontium 15
Kona Feldspar 60
Dolomite 20
Bentonite 2
Na2O .156
K2O .071
MgO .240
CaO .300
SrO .234
Al2O3 .277
SiO 2 1.583
I expect this started as a barium containing glaze, with SrO substituted.
Cooper needs more alumina, MacKenzie more silica.
In my opinion high magnesium glazes respond beautifully to Titanium dioxide
and/or small amounts of rutile. I am messing around with them with tin as
well a titanium and a bit of rutile.
A further note: In the MacKenzie it appears that the Mgo is just a little
less than the CaO suggesting a pretty high MgO content.
But the strontium belongs in the same group as calcium and therefore
"reduces" the proportion of MgO to the whole. But it might be a good glaze
to test with a bit of copper.
And, as pointed out in About Recipes, all of these glazes dance around the
same May Pole. Not a one is THAT different from the others. And, if you
test all of them on YOUR clay body, you might get very different results
from those gotten by a buddy who tested them on a DIFFERENT clay body.,
Lili Krakowski
Be of good courage
heuston@netzero.net on fri 29 sep 06
What are the cone for these glazes and is it reduction or oxidation?
Thanks Carol
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