Alisa Liskin Clausen on fri 14 jun 02
>
> Glaze test for Kleinsfield Gold, cone 6-7, ox.
>
> Glaze tested on white midrange stoneware fired in electric oxidation to
> 1220c.
>
> Source: Clayart
> Credited to: Jeff Dietrich
>
> 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 900c (1652f)
> hold for one hour at 900c
> shut off kiln
>
> Recipe:
> 4.49 Magnesium Carbonate
> 20.23 Whiting
> 5.62 Wollastonite
> 56.18 Neph. Sye.
> 13.48 Ceder Heights Redart Clay
>
> ADD
> 6.74 Red Iron Oxide
> 12.36 Zirocopax
>
> Note: All raw materials are measured up or down to the nearest whole
> decimal.
> Colorants or additives to a 100 gram test batch are measured in precent to
> the 100 gram test batch.
>
> Substitutions:Oldenwalder Clay for Redart
>
> Results:
> Gloss mustard gold glaze with slightly green cast, transparent. Runny but
> did not drip off tile. Crazed on my claybody.
>
>
> Regards from Alisa in Denmark
>
>
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Ron Roy on thu 20 jun 02
This base glaze is short of silica so is not a good choice for food bearing
surfaces.
It has a very high expansion ( high expansion on heating - high contraction
on cooling) so I would be surprised if it did not craze on any clay. One of
the problems with glazes that are low in silica - they are difficult to
stop crazing. Adding silica to a glaze is one way to help stop crazing.
>> Glaze test for Kleinsfield Gold, cone 6-7, ox.
>>
>> Glaze tested on white midrange stoneware fired in electric oxidation to
>> 1220c.
>>
>> Source: Clayart
>> Credited to: Jeff Dietrich
>>
>> 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 900c (1652f)
>> hold for one hour at 900c
>> shut off kiln
>>
>> Recipe:
>> 4.49 Magnesium Carbonate
>> 20.23 Whiting
>> 5.62 Wollastonite
>> 56.18 Neph. Sye.
>> 13.48 Ceder Heights Redart Clay
>>
>> ADD
>> 6.74 Red Iron Oxide
>> 12.36 Zirocopax
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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