jrmnr on sun 28 nov 04
Hi Ron and everyone who followed my shivering adventure,
I have now fired my forth kiln since the shivering glaze fault
appeared. Kilns one,two, and three had some shivered pots. Kiln three
was just a complete disaster, while two, and three had only a few
shivered pots. This morning I opened the forth one- 50 cft of carbon
trapping shino- and there was not one single shivering pot.
This makes me think that the culprit was either a bag of bad material
or my error in weighing out the materials. Kilns one, and three were
not hit as bad as kiln three, since the bad batch was dilluted with
remnants of a good glaze.
I also tested a line blend of Ron's modified no spod glaze and my
regular glaze and there was no difference in appearance. However when
I actually glazed a few pieces with Ron's glaze there was an
excessive crawling so I may just stick with the original version.
I hope that this concludes the incident and I'll never see any
shivering pot anymore.
Jiri
> --- In clayart@yahoogroups.com, Ron Roy wrote:
> > Hi Jiri,
> >
> > I just got more tests out - up to 23% soda ash in some of them - on
> a high
> > iron body and porcelain.
> >
> > I am fairly sure it has to do with process now so keep careful
> records of
> > your firing, glazing and cooling.
> >
> > I suggest you put some ware in with the thick applications - we must
> find
> > out if the changes make a difference.
> >
> > Make sure - when you are glazing that the glaze is well stirred -
> the Aussi
> > spod I have seems to be a courser grind than all my other materials.
> >
> > RR
> >
> > >Hi Ron,
> > >thanks for your advice. My supplier tells me that for the last eight
> > >years he has been getting the Aussi spod.So one potential culprit is
> > >out. As for the other materials I did not buy anything new for a year
> > >with the exception of soda ash.
> > >One thing that I changed during my firings, I stopped overnight
> > >kindling, but I am at the same temperature within an hour and a half
> > >as with kindling.
> > >I'll try your suggestions on test tiles and I won't double dip my
ware
> > >this time, since it seemed to be happening only where the glaze was
> > >thick, even though that gives me the best effects.
> > >Jiri
> >
> > 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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> >
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> >
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melpots@p...
>
>
______________________________________________________________________________
> Send postings to clayart@l...
>
> You may look at the archives for the list or change your subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at melpots@p...
Ron Roy on mon 29 nov 04
Hi Jiri,
Send that recipe back to me - I can probably fix the crawling.
Thanks for posting this to ClayArt.
RR
>Hi Ron and everyone who followed my shivering adventure,
>
>I have now fired my forth kiln since the shivering glaze fault
>appeared. Kilns one,two, and three had some shivered pots. Kiln three
>was just a complete disaster, while two, and three had only a few
>shivered pots. This morning I opened the forth one- 50 cft of carbon
>trapping shino- and there was not one single shivering pot.
>This makes me think that the culprit was either a bag of bad material
>or my error in weighing out the materials. Kilns one, and three were
>not hit as bad as kiln three, since the bad batch was dilluted with
>remnants of a good glaze.
>I also tested a line blend of Ron's modified no spod glaze and my
>regular glaze and there was no difference in appearance. However when
>I actually glazed a few pieces with Ron's glaze there was an
>excessive crawling so I may just stick with the original version.
>I hope that this concludes the incident and I'll never see any
>shivering pot anymore.
>Jiri
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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