Alisa Liskin Clausen on sun 8 sep 02
Glaze test for Turquoise cone 6 redux, fired to cone 6 ox.
Glaze tested on white midrange stoneware fired in electric oxidation to =
1220c.
Source: Clayart
Credited to:
Firing ramp:
100c p/h to 600c (212f - 1112f)
150c p/h to 1100c (330f - 2012f)=20
100c p/h to 1220c (212f - 2228f)
cool down max. per hour to 1100c=20
cool 80c per hour to 800c
shut off kiln
Recipe:
61.54 Neph. Syenite
20.88 Strontium Carb.
7.69 Silica
6.59 Ball Clay
3.30 Lithium carb.
3.5 Copper carb.
4.0 Betonies
1.0 Epsom salts
Note: All raw materials are measured up or down to the nearest whole =
decimal. =20
Colorants or additives to a 100 gram test batch are measured in percent =
to the 100 gram test batch.
Substitutions:None
Results
Covering, smooth, well melted turquoise matte glaze. Where thickest, =
there are tiny white crystals. A very bright
Turkish blue matte.
Accident.
Used Talc instead of Lithium carb.
Same glaze appearance but slightly greener.
Regards from Alisa in Denmark
Ron Roy on sat 14 sep 02
This gonna craze - it could be a stable glaze as it has enough alumina and
silica but also a pile of sodium - sodium promotes solubility and so does
copper - so test to be sure if you plan to use it on the business (food)
side of ware. I like the idea of subbing talc for lithium - talc has a low
expansion ( does not help much in this case) and not the toxicity that
lithium has.
4% bentonite is not a bad idea in this cause (2% is normal) cause this
glaze is going to want to settle out hard - good idea re the Epsom Salts
too.
RR
>Glaze test for Turquoise cone 6 redux, fired to cone 6 ox.
>Glaze tested on white midrange stoneware fired in electric oxidation to 1220c.
>
>Source: Clayart
>Credited to:
>
>Firing ramp:
>100c p/h to 600c (212f - 1112f)
>150c p/h to 1100c (330f - 2012f)
>100c p/h to 1220c (212f - 2228f)
>cool down max. per hour to 1100c
>cool 80c per hour to 800c
>shut off kiln
>
>Recipe:
>
>61.54 Neph. Syenite
>20.88 Strontium Carb.
>7.69 Silica
>6.59 Ball Clay
>3.30 Lithium carb.
>3.5 Copper carb.
>4.0 Betonies
>1.0 Epsom salts
>Results
>Covering, smooth, well melted turquoise matte glaze. Where thickest,
>there are tiny white crystals. A very bright
>Turkish blue matte.
>
>Accident.
>Used Talc instead of Lithium carb.
>Same glaze appearance but slightly greener.
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
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