tony clennell on sat 3 mar 12
Gang: Are there any thoughts out there on Texas talc. I have used it in my
low fire slip and I am getting a rutile blue appearance instead of the
white that I like. I understand is is high in magnesium.
Any body with any observations I'd be grateful.
Tc
--
http://smokieclennell.blogspot.com
KATHI LESUEUR on sat 3 mar 12
On Mar 3, 2012, at 10:31 AM, tony clennell wrote:
> Gang: Are there any thoughts out there on Texas talc. I have used it =3D
in my
> low fire slip and I am getting a rutile blue appearance instead of the
> white that I like. I understand is is high in magnesium.
> Any body with any observations I'd be grateful.
> Tc
>=3D20
> --
>=3D20
>
> http://smokieclennell.blogspot.com
Tony,
Part of the question is which "Texas talc". I used Texas talc for =3D
years with no problems. Then, suddenly a major problem of glazes pooling =
=3D
a running off of pieces. I later learned that they has closed one mine =3D
and were now mining the other side of the mountain. What you get varies =3D
from batch to batch significantly. Make sure you do lots of testing with =
=3D
any new bag of the stuff. With Ron Roy's help I just eliminated it and =3D
subbed dolomite. Not quite the same look, but close enough.
KATHI LESUEUR
http://www.lesueurclaywork.com
Celebrating with my second new knee. Two weeks out of surgery and =3D
walking well with a cane..=3D
ivor and olive lewis on mon 5 mar 12
Dear Tony,
Since high grade Talc is composed of 31.7% MgO and 63.5% SiO2 with 4.8% H2O
it sounds as though your sample is contaminated or the other ingredients o=
f
your slip are.
As you may know, Talc is soft mineral, being the sample for Mohs hardness o=
f
1. Massive material is used as a sculptural medium and to overcome its
softness it is fired at red heat when it converts into a harder material
called Enstatite. Enstatite has interesting optical properties.
Regards,
Ivor Lewis,
REDHILL,
South Australia
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