Donna Kat on thu 9 nov 06
Being who I am and not able to not play, I made a bunch of small bowls,
let them dry to leather hard and dipped them into the glazes I have just
to see what would happen. I loved the glazing and trimming and am
actually intriqued with the idea of now doing decorations by cutting away
the glaze. I was surprised at what glazes seemed to be happy and which
did not. Randy's Red was one I thought would not work and it seems happy
all around. Some of the glazes seem to be fitting quite solidly inside
and outside the pieces but flaked off of the lips. Others seemed to
bubble I'm sure will flake off but I don't know when. So the question
is... What is the worse that can happen? Should I bisque fire these
pieces to see how the glaze fits to that point? Will the glaze look solid
but then fall off and ruin my shelves if I try to glaze fire? How do I
test these things? What are the risks?
Donna
P.S. I really like the idea of the SingleGlaze group
http://groups-beta.google.com/group/pottery-single-firing
but no one seems to be there.
Jeoung-Ah Kim on thu 9 nov 06
Dear Donna,
Single firing (glazing on leader-hard stage) has a long history and tradition in China. This method is still using by many Chinese potters even teaching at all institutes at present China. Most of Chinese potters were surprised about that we normally do firing biscuit and then gloss when I was teaching at two different universities in China for 12 years ago and later when I had some Chinese students at the Masters programme in Finland and in Sweden.
In my experiences, the most distinguishable differences between single glaze firing and separate gloss firing can be the visual appearances after firing. You can easily compare them of colour, degree of shine/luster/gloss, whiteness, and degree of translucency, etc.
I see both methods have good and bad points: one is easier to brush painting and economical method while another is easier control process than another to get a satisfied result. Both methods can be explicitly tested however you may start empirical observations.
Kim
Donna Kat wrote:
Being who I am and not able to not play, I made a bunch of small bowls,
let them dry to leather hard and dipped them into the glazes I have just
to see what would happen. I loved the glazing and trimming and am
actually intriqued with the idea of now doing decorations by cutting away
the glaze. I was surprised at what glazes seemed to be happy and which
did not. Randy's Red was one I thought would not work and it seems happy
all around. Some of the glazes seem to be fitting quite solidly inside
and outside the pieces but flaked off of the lips. Others seemed to
bubble I'm sure will flake off but I don't know when. So the question
is... What is the worse that can happen? Should I bisque fire these
pieces to see how the glaze fits to that point? Will the glaze look solid
but then fall off and ruin my shelves if I try to glaze fire? How do I
test these things? What are the risks?
Donna
P.S. I really like the idea of the SingleGlaze group
http://groups-beta.google.com/group/pottery-single-firing
but no one seems to be there.
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Gary Navarre on fri 10 nov 06
Hi Single fires,
John Foster began teaching me about once firing by begining with engobs.
These are designed to be applyed to leather dry and bisqued. While soft
decoration can be scratched through the slip. It wasn't until I could do my
own loads that I could run a single fire and it wasn't much of a change in
formulas as long as there is enough clay. I even use supposedly twice fire
glazes (Mather Clear with ash, Dunham Blue).
When I worked at the Pot Shop I tryed an experiment with how wet the pot
could before a slip glaze with a bunch of ash would make the pot slump. I
made some bowls and after about a half hour throwing dipped the first and
set it on the shelf. I waited a little longer for each sussessive dip of the
next thrown so it was a little dryer. Later I took a look and not much was
going on so I sat with a wine and a book and waited. Wasn't long before
pieces of wet bowl started falling off. But some that were a bit dryer began
to hold up better until I found a place where the moisture was balanced and
the slip shrank with the bowl. What I do now mostly is brush on bone dry in
layers. I use single fire mainly for economy since I woodfire.
To be honest I totally forgot we have a singlefire group and I think I
might have signed up. Sometimes we just get busy with other projects. Stay
in there!
G in da U.P.
Hilltop Pottery on fri 10 nov 06
Hi Donna
I know alot of people only do single firings. I think it is great but
I don't do it because I have students at the studio and you have to
handle your VERY dry greenware carefully. So I do some once firing when
I need to fill a spot in the kiln that no glaze bisque fits...but my
students don't see that :) ....it sounds like your clay was too wet when
you put the glaze on and as the clay dried, the glaze was already dry so
it just popped off. My limited experience with once fired pieces has
shown me 2 thing...the greenware MUST be completely dry and it's the
same as bisque with oils on your hands....glaze will crawl on greenware
if it gets dirty/oily.
Since you like the carving idea have you thought of making a slip with
mason stains, painting it on your piece, letting it dry to leatherhard
and then carving the colored slip.
Nancy
Donna Kat wrote:
> Being who I am and not able to not play, I made a bunch of small bowls,
> let them dry to leather hard and dipped them into the glazes I have just
> to see what would happen. I loved the glazing and trimming and am
> actually intriqued with the idea of now doing decorations by cutting away
> the glaze. I was surprised at what glazes seemed to be happy and which
> did not. Randy's Red was one I thought would not work and it seems happy
> all around. Some of the glazes seem to be fitting quite solidly inside
> and outside the pieces but flaked off of the lips. Others seemed to
> bubble I'm sure will flake off but I don't know when. So the question
> is... What is the worse that can happen? Should I bisque fire these
> pieces to see how the glaze fits to that point? Will the glaze look solid
> but then fall off and ruin my shelves if I try to glaze fire? How do I
> test these things? What are the risks?
>
> Donna
>
> P.S. I really like the idea of the SingleGlaze group
>
> http://groups-beta.google.com/group/pottery-single-firing
>
> but no one seems to be there.
>
> ______________________________________________________________________________
> Send postings to clayart@lsv.ceramics.org
>
> 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@pclink.com.
>
>
Snail Scott on fri 10 nov 06
At 02:48 PM 11/9/2006 -0500, you wrote:
>Being who I am and not able to not play, I made a bunch of small bowls,
>let them dry to leather hard and dipped them into the glazes...How do I
>test these things?
Make some quick'n'dirty slabs to
fire them on. I don't see any
need to bisque; just take 'em on
up, slowly at first.
-Snail
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