Dan Dermer on mon 31 dec 01
Clayart is amazing in terms of how often I find just the right bit of
information, at just the right time.
Just this morning I was pondering blue slip in salt firing, after looking at
the following picture of a cool blue Michael Casson pitcher on this web
site: http://www.ece.utexas.edu/~perry/fun/pots/casson.html I was
thinking, "I wonder how well B-Mix slip with 2% cobalt would work in a soda
firing..." to approximate the look of the Casson pitcher I had seen. Can't
wait to see what others' responses are to Gary's question below. I don't
have access to a salt/soda kiln at the moment, but would like to investigate
this type of firing in 2002...
Happy New Year to all!
A lurker on Clayart,
Dan
-----Original Message-----
From: Ceramic Arts Discussion List [mailto:CLAYART@LSV.CERAMICS.ORG]On
Behalf Of gshaffer
Sent: Monday, December 31, 2001 10:21 AM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Re: CLAYART Digest -question on blue slip in salt
I have a question for you salt fire potters out there who use blue slip.
I fire reduction salt to cone 10 with both a grey body and a brown body
with a blue slip. It seems like the blue slip stays very blue only in
areas of the kiln that cool very fast, the rest of it goes a very dark
almost black color. I have tried faster cooling in the entire kiln by
leaving ports open and blowing air in and it helps marginally but still
many areas are very dark blue to black. It is a hard brick interior so
cools very slow. Do any of you have a slip formula that stays a bright
blue as opposed to turning this dark color and would you share it? Does
anyone know what is happening to the slip in cooling to make it go
darker? The slip I use is b mix with 2% cobalt carb. I am experimenting
all the time with less cobalt but it seems that even as I go lower the
areas that go dark in the kiln continue to do so. I like b mix as a slip
because it trails so nicely from a tint and toner bottle.
Thanks
Gary Shaffer
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gshaffer on mon 31 dec 01
I have a question for you salt fire potters out there who use blue slip.
I fire reduction salt to cone 10 with both a grey body and a brown body
with a blue slip. It seems like the blue slip stays very blue only in
areas of the kiln that cool very fast, the rest of it goes a very dark
almost black color. I have tried faster cooling in the entire kiln by
leaving ports open and blowing air in and it helps marginally but still
many areas are very dark blue to black. It is a hard brick interior so
cools very slow. Do any of you have a slip formula that stays a bright
blue as opposed to turning this dark color and would you share it? Does
anyone know what is happening to the slip in cooling to make it go
darker? The slip I use is b mix with 2% cobalt carb. I am experimenting
all the time with less cobalt but it seems that even as I go lower the
areas that go dark in the kiln continue to do so. I like b mix as a slip
because it trails so nicely from a tint and toner bottle.
Thanks
Gary Shaffer
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