C,
I think coloradopu was asking the question about the celadon firing.
Michael
Aug 20th, '09, 17:46
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shyrabbit
Aug 22nd, '09, 17:01
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Re: Fish Scale Glazes
michaelshyrabbit wrote:c,
Sorry for the slow response both here and to your PM's. I've had computer and wifi problems on and off for the last week...
I have two recipes for what is knows as "Fish Scale" glazes, I've been meaning to try for some time now. Generally, Fish Scale glazes tend to be very high feldspathic glazes that craze and that are applied rather thick. They look best over darker clay bodies.
You might also try the following recipes with various oxides to create different color effects. These recipes will produce milky white glazes with smooth "fat" and "buttery" surfaces. The excessive crazing will also likely give a visual depth to these glazes.
Maybe we can both, or any of the other potters here for that matter, test and compare our results here(?).
Michael
Glaze #1
cone 10-11, reduction
Soda Feldspar 80
Whiting 10
Clay 10 (try om-4 or EPK = different results)
Bone Ash 2
Glaze #2
cone 10-11, reduction
Cornwall Stone 85
Whiting 15
GLAZE #1
Soda Feldspar 80
Limestone 10
OM4 10
Bone Ash 2
RIO 0.50
someone put a partial bag of limestone in the whiting container. glad the bag was still intact and whole.
so the recipe serendipitously was changed and it came out...
Glaze #2 also was limestone instead of whiting. now i have to try the whiting recipe.
Aug 22nd, '09, 17:53
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Re: D. Michael Coffee (shyrabbit) Ceramics in Pagosa Springs, CO
Cory,
Not to worry...as glaze ingredients are often referred to by different names for the same thing...
Limestone is whiting and they are both Calcium Carbonate, or another way to look at it is:
Limestone = Calcium Carbonate = Whiting
All names for the same thing.
The same thing goes for:
Silica = Quartz = Flint
Also, Limestone's chemical composition will change from mine to mine, this is generally true for most of the ingredients we potters use in our glazes. This is one of the reasons why the same glaze mixed in different areas of the country will often be quite different when fired.
I love working with glazes and all their nuances,
Hope this helps,
Michael
Not to worry...as glaze ingredients are often referred to by different names for the same thing...
Limestone is whiting and they are both Calcium Carbonate, or another way to look at it is:
Limestone = Calcium Carbonate = Whiting
All names for the same thing.
The same thing goes for:
Silica = Quartz = Flint
Also, Limestone's chemical composition will change from mine to mine, this is generally true for most of the ingredients we potters use in our glazes. This is one of the reasons why the same glaze mixed in different areas of the country will often be quite different when fired.
I love working with glazes and all their nuances,
Hope this helps,
Michael
Aug 24th, '09, 00:38
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Re: D. Michael Coffee (shyrabbit) Ceramics in Pagosa Springs, CO
michael
mahalo. thanks for patience
i usually go by the recipe, percentages and don't use any subsitutions.
thank you for the information
thank you humbly
cory
mahalo. thanks for patience
i usually go by the recipe, percentages and don't use any subsitutions.
thank you for the information
thank you humbly
cory
Aug 27th, '09, 16:27
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Re: D. Michael Coffee (shyrabbit) Ceramics in Pagosa Springs, CO
Glaze firing today...the image below is of the reduction flame at the flue with the kiln temp @ 2050 F on its way to 2345 F
I posted this image just for fun...
Michael
I posted this image just for fun...
Michael
Aug 27th, '09, 17:31
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Re: D. Michael Coffee (shyrabbit) Ceramics in Pagosa Springs, CO
Michael,
You firing an updraft? Think I might get into the fish scale experiment too. Probably run both thru regular cone 10 and a soda firing.
Thanks -- Chris
You firing an updraft? Think I might get into the fish scale experiment too. Probably run both thru regular cone 10 and a soda firing.
Thanks -- Chris
Aug 27th, '09, 17:55
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Re: D. Michael Coffee (shyrabbit) Ceramics in Pagosa Springs, CO
Chris-
Yes, I love my up-draft kiln. I posted images of my kilns back on my page 4, about half way down, if you're interested.
I've not had time to test the fish scale glaze yet. Just remember that it has to be applied rather thick or it won't render the scale effect. Did you see Cory's plate that he stained with RIO. Turned out nice I think.
I will be interested to see what effect the soda has on this glaze, might be a surprise(?)
I look forward to seeing your glaze tests.
Michael
Yes, I love my up-draft kiln. I posted images of my kilns back on my page 4, about half way down, if you're interested.
I've not had time to test the fish scale glaze yet. Just remember that it has to be applied rather thick or it won't render the scale effect. Did you see Cory's plate that he stained with RIO. Turned out nice I think.
I will be interested to see what effect the soda has on this glaze, might be a surprise(?)
I look forward to seeing your glaze tests.
Michael
Aug 28th, '09, 03:08
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Re: D. Michael Coffee (shyrabbit) Ceramics in Pagosa Springs, CO
coolshyrabbit wrote:Glaze firing today...the image below is of the reduction flame at the flue with the kiln temp @ 2050 F on its way to 2345 F
I posted this image just for fun...
Michael
when do you start your reduction ?
cool photo !
Aug 28th, '09, 10:40
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Re: D. Michael Coffee (shyrabbit) Ceramics in Pagosa Springs, CO
c,
I start my reduction rather early @ 1560 F. Good for my shinos and for carbon trapping.
I would be curious what others do....?
Michael
I start my reduction rather early @ 1560 F. Good for my shinos and for carbon trapping.
I would be curious what others do....?
Michael
Aug 28th, '09, 13:32
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Re: D. Michael Coffee (shyrabbit) Ceramics in Pagosa Springs, CO
michaelshyrabbit wrote:c,
I start my reduction rather early @ 1560 F. Good for my shinos and for carbon trapping.
I would be curious what others do....?
Michael
me too.
good for copper reds too
cheers
i keep it in this reduction with temperature rising until cone 10 goes over.
Aug 28th, '09, 16:25
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Re: D. Michael Coffee (shyrabbit) Ceramics in Pagosa Springs, CO
I usually start reduction around 010, maybe I'll try lowering the start temp with the next firing to see what happens
Aug 29th, '09, 12:33
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Re: D. Michael Coffee (shyrabbit) Ceramics in Pagosa Springs, CO
michael
how many days do you wait until you open your kiln ?
thanks
cory
how many days do you wait until you open your kiln ?
thanks
cory
Aug 29th, '09, 12:52
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Re: D. Michael Coffee (shyrabbit) Ceramics in Pagosa Springs, CO
c,bonjiri wrote:michael
how many days do you wait until you open your kiln ?
thanks
cory
I open the kiln the next day.
By the next morning the temp. has dropped to 650 F, at which point I pull the peep pugs and let the temp. drop to 425 F. I then open the damper an inch or so until the temp. drops to 250 F, at this point I start unloading. I'm usually unloading by noon.
Michael
Aug 29th, '09, 22:42
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Re: D. Michael Coffee (shyrabbit) Ceramics in Pagosa Springs, CO
shyrabbit wrote:c,bonjiri wrote:michael
how many days do you wait until you open your kiln ?
thanks
cory
I open the kiln the next day.
By the next morning the temp. has dropped to 650 F, at which point I pull the peep pugs and let the temp. drop to 425 F. I then open the damper an inch or so until the temp. drops to 250 F, at this point I start unloading. I'm usually unloading by noon.
Michael
michael
thanks !
wow. that is cool
can't wait to see some new pieces you have.
kiln openings are so exciting !
ALOHA
c
Re: D. Michael Coffee (shyrabbit) Ceramics in Pagosa Springs, CO
+1, me too!
Maybe something, mmm, red?
Maybe something, mmm, red?