Donna Kat on tue 27 nov 07
I screwed up - I went to glaze, stirred up my glaze and thinking it too
thick I added water without checking the density (OOPS!). I glazed my pot
and the glaze immediately cracked badly (and it was not too thick on the
piece). Should I flocculate this glaze and let the water evaporate or
what? I have never had a problem with a glaze being too 'together'. I
recently read about this in the group but now cannot find it in a search.
Donna
Ron Roy on thu 29 nov 07
Hi Donna, You have an over flocculated glaze - you need to deflocc it. Tom
Wirt can tell you how - I have never done it.
Perhaps getting at least some of the GB out of the glaze will be the best
strategy in the long run.
RR
>I screwed up - I went to glaze, stirred up my glaze and thinking it too
>thick I added water without checking the density (OOPS!). I glazed my pot
>and the glaze immediately cracked badly (and it was not too thick on the
>piece). Should I flocculate this glaze and let the water evaporate or
>what? I have never had a problem with a glaze being too 'together'. I
>recently read about this in the group but now cannot find it in a search.
>Donna
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Timothy Joko-Veltman on thu 29 nov 07
Another thought: the Cornish Stone could have some solubles in it that
are flocculating the glaze; you don't need much of a sulfate (0.1%) to
thicken a glaze right up.
Cheers,
Tim
On Nov 29, 2007 10:39 PM, Ron Roy wrote:
> Hi Donna,
>
> Can't see why it would do that then - except you have 3% bentonite and
> nearly 10% ball clay - no need for that much bentonite - maybe try 1 or
> 1.5. You might try using calcined zinc - has anyone else found that to make
> a difference?
>
> The glaze is short of silica by the way - probably not durable.
>
> RR
>
>
> >>Hi Donna, You have an over flocculated glaze - you need to deflocc it.
> >Tom
> >>Wirt can tell you how - I have never done it.
> >>
> >>Perhaps getting at least some of the GB out of the glaze will be the best
> >>strategy in the long run.
> >>
> >>RR
> >>
> >>>I screwed up - I went to glaze, stirred up my glaze and thinking it too
> >>>thick I added water without checking the density (OOPS!). I glazed my
> >pot
> >>>and the glaze immediately cracked badly (and it was not too thick on the
> >>>piece). Should I flocculate this glaze and let the water evaporate or
> >>>what? I have never had a problem with a glaze being too 'together'. I
> >>>recently read about this in the group but now cannot find it in a search.
> >>>Donna
> >>
> >>Ron Roy
> >>RR#4
> >>15084 Little Lake Road
> >>Brighton, Ontario
> >>Canada
> >
> >Oddly there is no gerstley in this glaze. There is a lot of zinc. I
> >would not recommend this glaze to anyone, only have it for historical
> >reasons (will not ever make up a batch again), and only want to save it
> >because I'm such a bloody pack rat and can't bear to waste anything. This
> >may be my first attempt of self discipline and NOT rescuing a glaze (but
> >look at all that zinc that will go to waste... maybe if I dry it out,
> >reformulate it to have enough silica...) Sighhh...
> >
> >Donna
> >
> >////////////////////////////////
> > Ed's Satin White
> >
> >Custer Feldspar 4000
> >Corning Stone 2200
> >Whiting 1800
> >Ball Clay 1000
> >Zinc Oxide 800
> >
> >Titanium Dioxide 400
> >Bentonite 300
> >
> >______________________________________________________________________________
> >Clayart members may send postings to: clayart@lsv.ceramics.org
> >
> >You may look at the archives for the list, post messages, or change your
> >subscription settings here: http://www.acers.org/cic/clayart/
> >
> >Moderator of the list is Mel Jacobson who may be reached at melpots2@visi.com
>
> Ron Roy
> RR#4
> 15084 Little Lake Road
> Brighton, Ontario
> Canada
> K0K 1H0
>
> ______________________________________________________________________________
> Clayart members may send postings to: clayart@lsv.ceramics.org
>
> You may look at the archives for the list, post messages, or change your
> subscription settings here: http://www.acers.org/cic/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at melpots2@visi.com
>
Donna Kat on thu 29 nov 07
On Thu, 29 Nov 2007 02:04:37 -0500, Ron Roy wrote:
>Hi Donna, You have an over flocculated glaze - you need to deflocc it.
Tom
>Wirt can tell you how - I have never done it.
>
>Perhaps getting at least some of the GB out of the glaze will be the best
>strategy in the long run.
>
>RR
>
>>I screwed up - I went to glaze, stirred up my glaze and thinking it too
>>thick I added water without checking the density (OOPS!). I glazed my
pot
>>and the glaze immediately cracked badly (and it was not too thick on the
>>piece). Should I flocculate this glaze and let the water evaporate or
>>what? I have never had a problem with a glaze being too 'together'. I
>>recently read about this in the group but now cannot find it in a search.
>>Donna
>
>Ron Roy
>RR#4
>15084 Little Lake Road
>Brighton, Ontario
>Canada
Oddly there is no gerstley in this glaze. There is a lot of zinc. I
would not recommend this glaze to anyone, only have it for historical
reasons (will not ever make up a batch again), and only want to save it
because I'm such a bloody pack rat and can't bear to waste anything. This
may be my first attempt of self discipline and NOT rescuing a glaze (but
look at all that zinc that will go to waste... maybe if I dry it out,
reformulate it to have enough silica...) Sighhh...
Donna
////////////////////////////////
Ed's Satin White
Custer Feldspar 4000
Corning Stone 2200
Whiting 1800
Ball Clay 1000
Zinc Oxide 800
Titanium Dioxide 400
Bentonite 300
Ron Roy on thu 29 nov 07
Hi Donna,
Can't see why it would do that then - except you have 3% bentonite and
nearly 10% ball clay - no need for that much bentonite - maybe try 1 or
1.5. You might try using calcined zinc - has anyone else found that to make
a difference?
The glaze is short of silica by the way - probably not durable.
RR
>>Hi Donna, You have an over flocculated glaze - you need to deflocc it.
>Tom
>>Wirt can tell you how - I have never done it.
>>
>>Perhaps getting at least some of the GB out of the glaze will be the best
>>strategy in the long run.
>>
>>RR
>>
>>>I screwed up - I went to glaze, stirred up my glaze and thinking it too
>>>thick I added water without checking the density (OOPS!). I glazed my
>pot
>>>and the glaze immediately cracked badly (and it was not too thick on the
>>>piece). Should I flocculate this glaze and let the water evaporate or
>>>what? I have never had a problem with a glaze being too 'together'. I
>>>recently read about this in the group but now cannot find it in a search.
>>>Donna
>>
>>Ron Roy
>>RR#4
>>15084 Little Lake Road
>>Brighton, Ontario
>>Canada
>
>Oddly there is no gerstley in this glaze. There is a lot of zinc. I
>would not recommend this glaze to anyone, only have it for historical
>reasons (will not ever make up a batch again), and only want to save it
>because I'm such a bloody pack rat and can't bear to waste anything. This
>may be my first attempt of self discipline and NOT rescuing a glaze (but
>look at all that zinc that will go to waste... maybe if I dry it out,
>reformulate it to have enough silica...) Sighhh...
>
>Donna
>
>////////////////////////////////
> Ed's Satin White
>
>Custer Feldspar 4000
>Corning Stone 2200
>Whiting 1800
>Ball Clay 1000
>Zinc Oxide 800
>
>Titanium Dioxide 400
>Bentonite 300
>
>______________________________________________________________________________
>Clayart members may send postings to: clayart@lsv.ceramics.org
>
>You may look at the archives for the list, post messages, or change your
>subscription settings here: http://www.acers.org/cic/clayart/
>
>Moderator of the list is Mel Jacobson who may be reached at melpots2@visi.com
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
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