Lili Krakowski on mon 16 apr 12
Yes. Firing c.10 glazes at c.7 is not a good idea--unless, until, one =3D
has tested how it works before "committing" a whole kilnful.
But--without contradicting anything everyone else has said:
" False ash: came out okay at best, that one just needs some color =3D
adjustment. "
Ash glazes go into the melt "early". This actually might work at c.7
2." Temmoku: came out very thin...." Very thin might be expected if a =3D
glaze
goes into melt early and is taken way up. But here, we assume, it was=3D20
underfired. So very thin seems to equal too thin application. Many =3D
glazes
need special attention to application thickness. This may be one.
3. "Oatmeal: can barely tell there is any glaze where I applied it. " =3D
You seem to
have applied the glaze too thinly
4. "Rutile: This should be a rutile blue glaze. I know that TiO2 is a =3D
tan colorant so, i guess what I'm asking here
is did I get the wrong rutile?" =3D20
Rutile is NOT TiO2 which is white. Although in
formulas it is listed as TiO2 it is "an impure form of TiO2, which =3D
usually is found associated
with 1 to 25% of FeO and lesser amounts of silica, chrome, and =3D
vanadium"--says Parmelee.
Simply put. Rutiles are very variable, test each batch as it comes into =
=3D
the studio.
And, yes, the same "test first" is a good idea with all new materials.
I do not know when you were in college, nor where. But three factors=3D20
remain up in the air. =3D20
The materials we use are mined. Mine runs change/vary.
It is MOST unlikely that the materials you are using now are identical =3D
to those
you had back then.=3D20
Also: You used a different clay body when you were in college.
As we do not know what that was, nor what you are using now, we only can
assume that things look different on different bodies. (Something many =3D
should
think about when buying swimsuits!)
And last: the water you are using may have had an effect. Retest your =3D
glazes
with distilled or rain water.
As usual: test all materials that come new into your studio. Even frits =
=3D
have been known
to change.=3D20
Keep several (I suggest 3) different bodies for "your" firing temp in =3D
the
studio, make test tiles for them all. If a glaze does not turn out =3D
right on your "main"
body, retest on the two others. A huge number of glaze disappointments =3D
stem
from the clay body. =3D20
Test all glazes in different thicknesses on the test tiles.
This usually is done by mixing the glaze on the thin side, dipping whole =
=3D
test tile
once, letting dry a bit, dipping two thirds again, drying a bit, and =3D
dipping a third
time a third of the tile. You will have three thicknesses to guide you =3D
for future
application, when, clearly, you will mix your glaze to an adjusted =3D
consistency.
Lili Krakowski
Be of good courage
| |
|
