Carolyn Sawyer on mon 17 may 99
Just two more quick questions. Is Kona F-4 feldspar the same as F-4
feldspar? Also, I wanted to make up Sana's Green and I don't have Pioneer
Kaolin. There's a bucket of EPK/Kaolin/china clay at the community studio.
Can I use this instead? There's also Ky Ball clay and OM4, grolleg and
calcined Kaolin. What do you think?
Carolyn
making glazes while the power is out to the barn
Mo and Les Beardsley on tue 18 may 99
Carolyn Sawyer wrote:
>
> ----------------------------Original message----------------------------
> Just two more quick questions. Is Kona F-4 feldspar the same as F-4
> feldspar? Also, I wanted to make up Sana's Green and I don't have Pioneer
> Kaolin. There's a bucket of EPK/Kaolin/china clay at the community studio.
> Can I use this instead? There's also Ky Ball clay and OM4, grolleg and
> calcined Kaolin. What do you think?
> Carolyn
> making glazes while the power is out to the barn
Dear Carolyn
Kona f-4 feldspar is the same as f-4 feldspar. Soda feldspars have a
minute amount of silica and the balance is equal proportions of soda
feldspar and custer feldspar when it is mined.
Potash feldspar is 1/3 soda spar, 1/3 silica (close to that) and the
rest is potash feldspar.
Soda feldspar melts a cone lower or more because it has more soda in it.
You can use EPK to sub for most kaolins.
Regards
Les Beardsley
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