Rod Wuetherick on sat 4 dec 04
Thanks Ron,
It really intrigues me as to what is happening here. Perhaps it is the food
that was being heated. I think I'm going to try a little test myself, if
only to convince myself of what you and others have experience. None of my
glazes craze except for my shino glazes.
Anyways thanks for your reply I'm going to go microwave some plates with one
potato and come back here and tell you what you already know ;)
Peace,
Rod
-----Original Message-----
From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG]On Behalf Of Ron Roy
Sent: Saturday, December 04, 2004 11:01 AM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Re: Panasonic Computer Controlled Microwave Kiln?
Hi Rod,
I make dinnerware with a tenmoku glaze (7.5% iron) on porcelain and have
tested and used it extensivly in the microwave oven and have not found any
extra heating.
The first step in answering the question would be to soak some unglazed
porcelain for a few days and test it in the microwave to see if it is
absorbing water.
Many tenmokus are crazed by the way - this could be a factor in water being
absorbed into underfired clay.
An interesting question but is not the fault of the glaze in this situation
based on my experience.
RR
>Could you explain why a celadon on porcelain is cooler (much) from the
>microwave than a temmoku on porcelain?
>
>Just a practical observation...
>
>I confess I don't know the science but I do have first hand (ouch)
>experience...
>
>Cheers,
>Rod
>
>On a side note:
>There have been suggestions on this list in the past that
>iron-bearing glazes might heat up in a kitchen microwave,
>but I am skeptical due to the lack of mobility of the iron
>immobilized in the glaze matrix. The only other way I
>can think of that iron glazes could heat up in a microwave
>would be by induction heating, if there was enough iron
>in a continuous conductive mass. I doubt this is ever
>going to be the case in a normal glaze, but it might be
>a good subject for experimentation!
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
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Ron Roy on sun 5 dec 04
Hi Rod,
Just put in a cup or bowl with some water in it to prevent dammage to your
oven - and also empty pots with the celadon and tenmoku glazes - microwave
for 10 seconds on high - feel the test pots - repeat at 10 second intervals
till the water in the control pot boils.
That should tell you all you need to know.
RR
>Thanks Ron,
>
>It really intrigues me as to what is happening here. Perhaps it is the food
>that was being heated. I think I'm going to try a little test myself, if
>only to convince myself of what you and others have experience. None of my
>glazes craze except for my shino glazes.
>
>Anyways thanks for your reply I'm going to go microwave some plates with one
>potato and come back here and tell you what you already know ;)
>
>Peace,
>Rod
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
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