paul gerhold on tue 20 sep 11
I have reviewed everyone's discussions and articles and pictures on slow
cooling glazes and the conclusion I come to is that there is a major effect
on glazes when crystal formation is desirable. This is true when large
crystals or small crystals are desired and the difference is rate and timin=
g
of cooling. So slow cooling can be desirable when working on crystalline
matts or adventurine glazes.
On the other hand when gloss glazes or glaze interactions (not forming
cryatals) is the objective fast cooling can be advantageous if for no other
reason than energy conservation.
Am I drawing the correct conclusion?
Paul
Ron Roy on wed 21 sep 11
Hi Paul,
Yes - cool as fast as you can consistent with the results you want.
What John found out during his experiments was - when some glazes are
cooled slower they became much more interesting - and in fact
resembled those fired in fuel burning kilns. The conclusion we came to
was - because glazes cool slower in bigger - better insulated kilns -
more crystals formed.
Some potters could not believe some of the glazes in our book were not
fired in reduction.
RR
Quoting paul gerhold :
> I have reviewed everyone's discussions and articles and pictures on slow
> cooling glazes and the conclusion I come to is that there is a major effe=
ct
> on glazes when crystal formation is desirable. This is true when large
> crystals or small crystals are desired and the difference is rate and tim=
ing
> of cooling. So slow cooling can be desirable when working on crystalline
> matts or adventurine glazes.
>
> On the other hand when gloss glazes or glaze interactions (not forming
> cryatals) is the objective fast cooling can be advantageous if for no oth=
er
> reason than energy conservation.
>
> Am I drawing the correct conclusion?
>
> Paul
>
ivor and olive lewis on mon 26 sep 11
Dear Paul gerhold,
I would amend your second proposition, limiting it to Transparent Glazes.
This assumes all of the ingredients are in solution.
Regards,
Ivor Lewis,
REDHILL,
South Australia
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