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Lesson Plans

Glazes and safety

[ Thread ][ Subject ][ Author ][ Date ]
Pat Duncan (pdmun)
Thu, 18 Feb 1999 21:34:59 -0800


I would like to comment on these glazes. As a high school teacher, I am
always concerned about safety. Mine - is most important to me. Poisons that
can be absorbed or inhaled are always a concern. Then there is the issue of
girls who are pregnant and don't know it yet to even warn you.

Many of these chemicals are very toxic if not handled properly. Please use
extreme care especially with the
Barium carbonate. I will not even keep it on campus.

Kids are kids. And we all tend to put our bare hands in too many things
that we shouldn't.

Please check on the proper way to use and store these chemicals for your

Pat Duncan
Ceramics Teacher
Madera High School
Madera, CA

These are reliable glazes that work well with many possibilities. If you
need more information, let me know. Carole Iacovelli

Glaze Possibilities

Smooth Stoney cone 4-6
a semi transparent, semi gloss base
Nepheline Syenite 40.7
Whiting 9.1
Zinc Oxide 3.9
Magnesium Carbonate 2.9
Barium Carbonate 12.5
China Clay 5.8
Silica 25.4

add 8% rutile for a light tan
add 4% red iron oxide for a pretty soft green
add 8% red iron oxide for a dark brown green

LA Matt cone 5-6
smooth mostly opaque matt, good in oxidation and reduction

Feldspar 15.48
Silica 1.68
Whiting 5.64
Zinc Oxide 2.58
Kaolin 4.62

many additives work well with this glaze base

Bright Glaze cone 6
There are several variations of this glaze from Behrens, will be gloss at
lower temperatures as well. This one stays in suspension pretty well.

Whiting 10
Gerstley Borate 15
Barium Carbonate10
Talc 5
Nepheline Syenite 30
Silica 20
Lithium Carb 5
China Clay 5

Carole Iacovelli
Punahou School
1601 Punahou Street
Honolulu, HI 96734
art@punahou or carolei

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