Lee Love on wed 10 mar 04
On Mon, 8 Mar 2004 21:53:49 -0800, Snail Scott wrote:
>Yes, IF the non-plastic components make up the
>bulk of the recipe. Otherwise, shrinkage will
>tend to cause thick applications to crack off,
>or at least to cause chasms in the fired glaze
>surface that are too wide to melt across and
>'heal'. When you make up your glaze, replace
>any raw clay with a calcined version of the
>same clay, and it may work OK.
I think Wayne was talking about trailing glaze. It isn't necessary to
change the ingredients in a glaze. Did you think he was speaking about
slip that is usually used beore the bisque?
Lee in Mashiko
Snail Scott on thu 11 mar 04
>On Mon, 8 Mar 2004 21:53:49 -0800, Snail Scott wrote:
>
>>Yes, IF the non-plastic components make up the
>>bulk of the recipe. Otherwise, shrinkage will
>>tend to cause thick applications to crack off..
>
At 11:50 PM 3/10/04 -0500, Lee Love wrote:
> I think Wayne was talking about trailing glaze. It isn't necessary to
>change the ingredients in a glaze.
I got the impression (apparently wrong) that
he wanted to use a very thick application;
I missed the reference to glaze-trailing.
Some glazes do have shrinkage issues when
applied very thickly, especially those with
some raw-clay content. Not an issue for Wayne
in this case, as it turns out, but perhaps a
consideration for others.
-Snail
Lee Love on fri 12 mar 04
Snail Scott wrote:
>
>Some glazes do have shrinkage issues when
>applied very thickly,
>
You also have to test, if you are applying one kind of glaze
on top of another. Some glazes don't stick to others very well.
The traditional Mashiko glazes used for slip trailing
(Nuka, Nuka Sage, Kuro Ame, Kaki) all have ash in them, except for
Mashiko kaki. People say that the kaki is calcinated to keep it
from mottling in the glaze firing. I have not experienced this
mottling from raw kaki.. I wonder if the real reason it is
calcinated is make it behave better when used in slip trail
decoration? I will test and find out,
-- Lee In Mashiko http://mashiko.us
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