Brendan Fitz on sat 16 jan 10
I don't believe you're filling the ware with soluble material while glazing=
=3D
. As the water evaporates after glazing the water soluble materials migrate=
=3D
to the surface of the piece, which is why you will see crystalline build u=
=3D
p on the surfaces of pieces glazed with a carbon trap shino for instance, t=
=3D
he crystalline build up being the soda ash traveling to the surface of the =
=3D
pot as the water evaporates. Even if large quantities of soluble alkalies a=
=3D
nd alkaline earths were to saturate a piece while glazing, which I don't be=
=3D
lieve is possible, I don't=3DA0think it would affect the vitrified strength=
o=3D
f a pot once fired. If water solubles were to permeate an entire piece, fil=
=3D
ling every pore, I think the only possible effect it would have on the body=
=3D
would be to lower the melting temperature of the body. Just my two cents.=
=3D
=3D0A=3D0A-Brendan Fitzpatrick=3D0A=3D0A=3D0A=3D0A=3D0A____________________=
____________=3D
=3D0A=3DA0A. E. Maurland cracking pots=3D0A=3D0A=3D0AWhat I like is that=3D=
A0 whiting s=3D
hrinks a lot, and therefore gives you some "space" to play with.=3DA0 =3D0A=
=3D0AT=3D
his is a calcium borate glaze of which there are many.=3DA0 You may end up =
ha=3D
ppier with another recipe altogether.=3D0A=3D0ABUT here comes a theory I ca=
nnot=3D
really test, but your saying you throw very thin brings chills to my heart=
=3D
.=3D0A=3D0AMy theory is this--and PLEASE everyone shoot it down--that when =
wate=3D
r soluble materials are used, they=3DA0 seep into the body....If a pot is v=
er=3D
y thin, then the soluble material=3DA0 permetates the WHOLE body of the pot=
, =3D
fluxing it, in essence, and making it much weaker, more fragile.=3D0A=3D0AO=
ne o=3D
f my opinionated opinions is that it it neither the glaze, NOR the body tha=
=3D
t determines things, but the interface of the two.=3DA0 The soluble materia=
ls=3D
affect that interface a whole lot.=3D0A=3D0ANow Elizabeth.=3DA0 I find it =
very h=3D
ard to believe that someone bought functional pottery and never used it...E=
=3D
ven if she planned to use it for Passover tableware, a year includes one Pa=
=3D
ssover...And if she displayed the pieces she may not have USED them, but ma=
=3D
y have washed them here and there.=3D0A=3D0AYou write that a few of your pl=
ates=3D
broke, so you now make thicker plates.=3D0AThat may be "where it is at."=
=3DA0 =3D
That the ware is too thin to sustain that glaze.=3D0A=3D0AAnd last--are you=
usi=3D
ng the same batch of clay as you have been using all along?=3DA0 Or did a n=
ew=3D
supply of "same" body get in the production cycle there somewhere?=3D0A=3D=
0AI =3D
wish you the best.=3D0A=3D0ALili Krakowski=3D0ABe of good courage=3D0A=3D0A=
=3D0A
Neon-Cat on sat 16 jan 10
Lili and all, here are some examples from John Shirley of S. Africa --
he uses soluble materials on thin bone china. His photos show the
inside of vessels:
http://johnshirleyceramics.blogspot.com/
(view 'recent work')
Marian
Neon-Cat
Lili wrote: "My theory is this--and PLEASE everyone shoot it
down--that when water soluble materials are used, they=3DA0 seep into the
body....If a pot is very thin, then the soluble material=3DA0 permetates
the WHOLE body of the pot, fluxing it, in essence, and making it much
weaker, more fragile.
One of my opinionated opinions is that it it neither the glaze, NOR
the body that determines things, but the interface of the two.=3DA0 The
soluble materials affect that interface a whole lot."
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