Avril Farley on sat 8 jun 02
Please can anyone advise me re the 'correct' clay thickness for shallow =
porcelain bowls for macro crystals. My last three bowl firings have =
resulted in beautiful crystals but shattered pots, dunting in the kiln =
on cooling while bottle forms of the same clay and of similar thickness =
with the same glaze in the same firing have survived beautifully.
On average the finished walls of my recent pieces is 2 millimetres (16th =
of an inch), and I have tried both using the same crystal glaze on the =
exterior, or a wide firing transparent glaze opacified with zirconium, =
both have succumbed to post fire dunting.
Help, please! Avril in the forest UK
william schran on mon 10 jun 02
Avril - You will need far less glaze thickness applied to
bowls/plates. Where I would brush 3 - 5 coats on a vase form, I brush
one coat on interior of bowls and a second coat up near the rim. Even
this can sometimes result in a fairly thick glaze pooling at the
bottom of the bowl. I use a clear glaze on the exterior to avoid
having to make pedestals.
Bill
Tommy Humphries on mon 10 jun 02
perhaps getting the bowls up off the kiln shelf would aid in the more even
cooling of the piece...the shelf is retaining too much heat, and the thin
rims of the bowls are cooling much faster than the feet.
Tommy]
----- Original Message -----
From: "Avril Farley"
On average the finished walls of my recent pieces is 2 millimetres (16th of
an inch), and I have tried both using the same crystal glaze on the
exterior, or a wide firing transparent glaze opacified with zirconium, both
have succumbed to post fire dunting.
Help, please! Avril in the forest UK
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