Sheron Roberts on mon 18 aug 03
For a while I was experiencing=20
bad blisters also. Determined
to figure this one out I refired
a mug at least three times; still
blisters.
My question is, if the impurities
didn't burn out during the first firing
wouldn't they eventually burn
out during all the refires? =20
I was just curious about this. =20
Actually anything that comes out
blistered now goes to target practice.
Sheron "dead-eye" Roberts in NC
Ron Roy on tue 19 aug 03
Hi Sheron,
Once the clay is vitrified and/or the glaze melted the impurities are
locked in - will not matter how often they are fired.
To make matters worse - every refiring melts every thing more so the
problem gets worse. You may find that refiring a cone or two lower each
time may be a better solution.
In the mean time - slow your bisque firing down and make sure there is
excess oxygen during the crucial stage - from 700C till the end. If a piece
of wood burns inside the kiln it means there is oxygen there - don't burn
too much of it because the burning uses up oxygen. If it only smokes in the
kiln there is not enough oxygen.
RR
>For a while I was experiencing
>bad blisters also. Determined
>to figure this one out I refired
>a mug at least three times; still
>blisters.
>My question is, if the impurities
>didn't burn out during the first firing
>wouldn't they eventually burn
>out during all the refires?
>I was just curious about this.
>Actually anything that comes out
>blistered now goes to target practice.
>Sheron "dead-eye" Roberts in NC
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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