Earl Krueger on wed 24 mar 04
On Mar 24, 2004, Marilu wrote:
> If the glaze runs like it did on some of the
> tests does it affect the actual color of the
> glaze too or is it just the fit that is affected?
Marilu,
Glad you liked the web-site.
One of the reasons there was so much running
on the test pots is because the glaze coat was
pretty thick. This is something that still causes
me lots of grief. My glaze coats seem to be
either too thin or too thick. Once in a while I get
it just right.
Based on these experiences what I have seen is
with too thin a coat the glaze seems to soak
into the clay body like water on a paper towel.
Then I get a rough surface and the colors can be
drastically different and are usually splotchy.
That is what happened with my Ughly pot.
When the glaze coat gets to a certain thickness then
the clay surface layer seems to get saturated and
the glaze forms a smooth finish with uniform color.
Too thick a glaze coat doesn't seem to change the
color much but then the glaze flows and runs off the
pot. Where the glaze flows there are streaks,
especially with Rutile or Titanium Dioxide in the glaze.
This can be seen in the close-up photos.
I think the trick for this glaze with the way I fire, and
with my particular kiln, would be to reformulate it to
contain more alumina to reduce the runnyness.
At least that's my plan.
You probably need to run your own series of color and
thickness tests to see what happens. If you do I would
like to hear about your results.
Thanks...
Earl K...
Bothell, WA, USA
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