Karen Thorn on fri 7 sep 07
hey everyone, once again thank you all for the advice on RAKU! God it
nice to have this much processional advice at hand! Thank you all.
New Question:
I ordered a Sink, however it is a cone 10 sink that will be bright white as
bisque. I make tiles with a clay this when bisque fired turns a light
brown. I spoke to the guy at bcpottery and he said they only make the cone
1,6, and 10 sinks, at this point they have not made bodies with colors
included. So... my question is...
If I take this bisque sink which is cone 10 and make a liquid slip out of my
cone 10 wet clay that is light brown in color. can I apply the slip to the
bisque and fire it again. SO that woudl be the second bisque firing. What I
am getting at is once this is done, then the sink should match the tike I
make by color. That way my glaze should react the same way? RIGHT???
Do anyone here know how thin or think the slip should be to coat a bisque
item? Has anyone done it before?
Thanks
kt
WJ Seidl on fri 7 sep 07
Karen:
Does your clay slip have the same expansion and shrinkage rate as the
bisqued sink?
Better check...
Best,
Wayne Seidl
Karen Thorn wrote:
> hey everyone, once again thank you all for the advice on RAKU! God it
> nice to have this much processional advice at hand! Thank you all.
>
> New Question:
>
> I ordered a Sink, however it is a cone 10 sink that will be bright white as
> bisque. I make tiles with a clay this when bisque fired turns a light
> brown. I spoke to the guy at bcpottery and he said they only make the cone
> 1,6, and 10 sinks, at this point they have not made bodies with colors
> included. So... my question is...
>
> If I take this bisque sink which is cone 10 and make a liquid slip out of my
> cone 10 wet clay that is light brown in color. can I apply the slip to the
> bisque and fire it again. SO that woudl be the second bisque firing. What I
> am getting at is once this is done, then the sink should match the tike I
> make by color. That way my glaze should react the same way? RIGHT???
>
> Do anyone here know how thin or think the slip should be to coat a bisque
> item? Has anyone done it before?
>
> Thanks
> kt
>
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William & Susan Schran User on fri 7 sep 07
On 9/7/07 12:20 PM, "Karen Thorn" wrote:
> I ordered a Sink, however it is a cone 10 sink that will be bright white as
> bisque. I make tiles with a clay this when bisque fired turns a light
> brown. I spoke to the guy at bcpottery and he said they only make the cone
> 1,6, and 10 sinks, at this point they have not made bodies with colors
> included. So... my question is...
>
> If I take this bisque sink which is cone 10 and make a liquid slip out of my
> cone 10 wet clay that is light brown in color. can I apply the slip to the
> bisque and fire it again. SO that woudl be the second bisque firing. What I
> am getting at is once this is done, then the sink should match the tike I
> make by color. That way my glaze should react the same way? RIGHT???
>
> Do anyone here know how thin or think the slip should be to coat a bisque
> item? Has anyone done it before?
Did you ask what color the clay will be when fired to ^10? You can't always
judge by the color at bisque temperature what color the clay will be at
higher temperature. Are you firing in electric or gas kiln? The atmosphere
in the kiln can also affect the final clay color.
Slips, which in this instance I would call engobe, can be applied to wet,
dry or bisque fired clay, BUT, you will need to alter the composition of the
slip, introducing calcined and non-clay additives to get the liquid engobe
to adhere to the bisque fired clay. If you simply apply the liquid clay
slip, it will probably flake off when it dries or when it is fired.
--
William "Bill" Schran
wschran@cox.net
wschran@nvcc.edu
http://www.creativecreekartisans.com
Dannon Rhudy on fri 7 sep 07
Karen asked:
> I ordered a Sink, however it is a cone 10 sink that will be bright white >
> If I take this bisque sink which is cone 10 and make a liquid slip out of
my
> cone 10 wet clay that is light brown in color. can I apply the slip to
the
> bisque and fire it again. .......
Karen, the odds are very good indeed that if you put wet slip on a
bisque piece, when you refire it the slip will not stay in place. The
bisque piece has already shrunk a certain amount. The slip has not,
and further the slip has a large percent of water. It is going to shrink
considerably. The likelihood is that you'll ruin your sink surface if
you try this.
There are slips that can be constructed to go on bisque, but in
your case it would be purely experimental. You don't know the
claybody that the sink is made of. Further, since you asked this
question, your experience is limited in this area. Find another way
to make the surfaces match when you're finished firing, or change
the surface of the other parts to be white when fired - apply white
slip to the unfired clay, for instance.
If you do succeed in making a slip that will stay on your bisque
sink, then for a properly smooth sink surface, you should spray
your slip on rather than brushing.
regards
Dannon Rhudy
Rogier Donker on sat 8 sep 07
Kathy!
Slip is watered down clay. You put it on a cone ten fired body (or
any bisqued body for that matter) it will have to shrink as it
dries.... it will peel right off your bisque.... colored slips, also
known as engobes, can only be applied to unfired clay. Usually done
in the leather heard stage... If you want to color that sink try a
water/iron oxide solution to make it tan... gonna have to experiment
with that as iron oxide is a very, very strong colorant....
Rogier
See us on the web at http://www.donkerstudio.org
Meg Smeal on sat 8 sep 07
why don't you call the company and ask for some 1)test tiles or 2) pieces of
old sinks that have broken in their bisque - then you can test away - meg
smeal
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