Malone & Dean McRaine on sat 26 apr 97
Aloha ClayArters and Arteresses. I should know the answer to this but my
thinking is muddled today. Does deflocculating a glaze alter the thickness
of the application on the pot? I have a glaze with Gerstley Borate in it
that doesn't flow enough to fill in all the detailed surface decoration on
my pots. I can't water it down or it will be too thin. If I deflocculate
it, will I have to reduce the water content to get the same thickness of
application? Any suggestions on deflocculants will be helpful too.
Thanks
Dean
With Aloha blessings,
Malone
lili krakowski on fri 4 dec 09
Ulf: Apologies, but I do not really understand the question.=3D20
The best explanation available to me is Parmelee's. Who speaks of =3D
viscosity as a "property of fluids" that "controls the thickness =3D
uniformity of the matured glaze" And like that. Parmelee goes on to =3D
explain it all.
I am not at all clear where we go, where you would like [us] to go with =3D
this.
As far as I know the viscosity of a glaze depends on what the potter =3D
wants to achieve. For clear glazes a more fluid melt is wanted than for =
=3D
a matt depending on immaturity. But that is no more a revelation than =3D
telling you that for a pudding you want a starch/liquid mix thicker than =
=3D
for a sauce, thicker than for a soup....In this cookery example the =3D
balance is between a starch (and there are different starches with =3D
different effects) and a liquid. In glaze the balance is between fluxes =
=3D
and alumina/silica. =3D20
There are "Limit formulas" which are educated guesses about what =3D
proportions of flux/alumina/silica will produce the best results at =3D
specific temperatures.
But one must remember that the actual viscosity of a glaze is affected =3D
by several extraneous [?] factors: the clay the glaze is on, the speed =3D
and kind of firing and cooling...
May I ask what you are trying to achieve?
=3D20
Lili Krakowski
Be of good courage
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