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shino bubbles and blisters

updated tue 12 jun 12

 

Eva Gallagher on mon 11 jun 12


Hi - I just had the worst wood firing ever - I had replaced the front
section of the train kiln with hard brick from soft so as to even out the
temperatures from front to back. What I got in the front section that was
mostly MD shino was a lot of bubbling. I think that it was underfired - as
cone 10 was barely down in the front section - however I don't really think
shinos bubble that much. Those pieces were loaded several days before and i=
t
rained a lot and probably fog as well. One small bowl that was glazed the
day of the firing was mostly OK except for some crawling on the flame side =
-
it was totally wet when the kiln started up.
Has anyone else experienced bubbles with MD shinos rewetting from either
rain or fog?
Last year I left out a bowl in the fog and the next day the raw glaze was
blistered. I fired it like that and the shino never smoothed out - that's
why I think that shinos do not bubble during melting (unless over another
glaze). I have refired a few pots to cone 7 electric but no movement -
bubbles the same size. Will try gas cone 10 next but do not think it will
help.
You can see the grisly details of the firing on my blog
http://newfoundoutpotter.blogspot.com/
Any ideas?
Regards,
Eva Gallagher
Deep River, Ontario
http://newfoundoutpotter.blogspot.com/