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do i understanding glaze production?

updated sat 24 feb 01


iandol on fri 23 feb 01

Recent discussions about ways of creating, firing and testing glazes =
have provided a considerable degree of enlightenment, judging by =
responses of Clayart participants. So, I am wondering how much is really =
known about fundamentals. Just how good are potters and ceramic artists =
at observing test results and interpreting them.
Take a hypothetical example.Suppose we imagine a line blend of two =
substances and test the 90%/10% to 10%/90% increments. Ignore the single =
substances. These nine samples are fired to Orton cone 6 or higher.
Observation shows that at one end of the test tile there is a smooth =
glossy opaque sample and at the other there is a matt opaque sample. the =
central sample is a shiny transparent glass with no porosity or =
inclusions. Intermediate examples show gradual changes between the =
What information can we deduce from such results?
What causes these differences?
Can you describe the heating and cooling behaviour of the three =
extremes. They do represent, in general, three of the most commonly used =
surface finishes.
Can you describe the melting and cooling behaviour of these samples. If =
you can, please justify your conclusions and reply under the subject of =
"Glaze Interpretation".
Ivor Lewis. Redhill, South Australia.
Being inquisitive again.