Dean on fri 28 oct 11
Hi, Any suggestions on how to get a cleaner melt from this glaze?=3DA0 It's=
r=3D
eally pretty about one time in 20.=3DA0 The rest it's kind of hazy, like it=
h=3D
asn't quite melted enough.=3DA0 And often the inside of a pot will look bet=
te=3D
r than the outside.=3D0AMahalos,=3D0ADean=3D0A=3D0A=3D0AFlambe ^10 oxidatio=
n=3D0A=3D0AGer=3D
stley borate=3DA0=3DA0=3DA0 =3DA0=3DA0=3DA0=3DA0=3DA0 9=3D0ACuster feldspar=
=3DA0=3DA0=3DA0 =3DA0=3DA0=3D
=3DA0 25=3D0ASoda feldspar=3DA0=3DA0=3DA0 =3DA0=3DA0=3DA0 25=3D0AWhiting=3D=
A0=3DA0=3DA0 =3DA0=3DA0=3DA0 1=3D
1.1=3D0AZinc oxide=3DA0=3DA0=3DA0 =3DA0=3DA0=3DA0=3DA0=3DA0 2.65=3D0ASilica=
=3DA0=3DA0=3DA0 =3DA0=3DA0=3DA0 =3D
28.52=3D0ACopper carbonate=3DA0=3DA0=3DA0 =3DA0=3DA0=3DA0=3DA0=3DA0 0.4=3D0=
ASilicon carbide=3DA0=3D
=3DA0=3DA0 =3DA0=3DA0=3DA0=3DA0=3DA0 0.18=3D0ATin oxide=3DA0=3DA0=3DA0 =3DA=
0=3DA0=3DA0=3DA0=3DA0 1.05
John Britt on sat 29 oct 11
My experience with silicon carbide reds in oxidation is that you have to =
=3D
have=3D20
longer soaks at peak or double fire them. The silicon carbide has to foam=
=3D
out and=3D20
that causes problems with a clean pinhole free surface.
John Britt Pottery=3D20
http://ncclayclub.blogspot.com
Bonnie Staffel on sun 30 oct 11
John, don't like to dispute your vast knowledge of clay and glazes, but =3D
I
have used silicon carbide for local reduction glazes at Cone 9/10 =3D
oxidation
with no problems with the final finish of the glaze. My recipes came =3D
from
Toshiko back in 1951 when we were students together at Cranbrook. In the
school kiln, my glazes came out with a tiny peacock feather pattern =3D
breaking
up the red. However in my home kiln, which went a little faster, the red =
=3D
was
solid color and a little darker.=3D20
On my website of Pottery Page, the first photo of several pieces, but =3D
large
bowl has a pattern of silicon carbide red as well as a blue in the =3D
center
with her glaze. The smaller pots with copper red in that photo are my =3D
low
fire electric reduction fired low fire glaze. At the time of making the
large bowl, I also made a large platter with multi glazes of Toshiko's =3D
all
using silicon carbide for local reduction. It came out perfectly.=3D20
Regards,
Bonnie
http://webpages.charter.net/bstaffel/
http://vasefinder.com/bstaffelgallery1.html
DVD Throwing with Coils and Slabs
DVD Introduction to Wheel Work
Charter Member Potters Council
| |
|
