Raku Boy on tue 29 feb 00
Hello Clayarters!
My Question regards sawdust firing in a steel trash can. I Fired
yesterday for the first time in a 40 gallon(or 30?) trash can and I got a
slight varience in blacks/greys. I was only using straw/dung/sawdust so I
believe that with other materials, or which I have a list, I can get more
color. HOWEVER...
I was wondering - if the sawdust fires too fast are you risking loss
of color? And also - Should I be plugging holes that the sawdust has burned
past? One more question - I'm going to plug unessesary holes - will epoxy
putty work or do I have to use refractory fiber as Stephen Branfman suggests
in his book "Raku a Practical Approach" (Which has a small section on
pit&sawdust firing).
I was seeing flames and I believe that there was too much oxygen in
the can. It was a windy day which may have fed the fire.
Any knowledge on the subject would be appreciated!
- John Christensen
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WHew536674@cs.com on wed 1 mar 00
You aren't going to get "color" with sawdust, hay, etc. You will get black
and gray, and unsmoked areas. If it is burning too fast, fiber blanket will
work in plugging the holes, or I have simply plugged with clay on windy days.
If it burns too fast, you won't get much black, but it can be refired. For
color using copper carb, etc., and kosher salt for texture, pit firing is
more effective, but that is a different firing technique.
Joyce A
Raku Boy on thu 2 mar 00
I realize that you don't get "color" with sawdust, dung and straw...
I've experimented with that and I know that all you get is greys and
blacks. That(color) wasn't my question though.
I do not have access to ceramic fiber - nor would I like to cut
small pieces of it up or handle it on a regular basis. Clay is a good
temporary solution though. Can someone answer the question if epoxy putty
will work? I know that would be permanent...
While we're on color though (as researched from the Clayart Archive)
Copper Wire
Cobalt & Iron Oxide (and other Oxides)
Copper - Carbonate/Oxide - Soluable
Seaweed/Kelp
Dead Fish(?)
Shiny Magazine Paper - National Geographic - Has Kaolin in it
Burnishing (can Effect Color - Burnish w/silver spoon - get a lot of tarnish
Terra Sig. - Burnished
Solving Salt - Kosher Salt
Solving Salt(table salt) in water with Copper Oxide/Cabonate - Paint pot w/
mixture
Cedar - gives Oranges
Grog - Red Specks in clay
Aquarium Colored rocks
Red Iron Oxide + Copper Carb
Particle Board (?)
That's most all of it that I could find in the archives anyone want to add
special recipies?
Can a sawdust firing burning too fast (4 hours for a 30 gallon trash can)
mess up coloring?
Thanks
- John
>You aren't going to get "color" with sawdust, hay, etc. You will get black
>and gray, and unsmoked areas. If it is burning too fast, fiber blanket
>will
>work in plugging the holes, or I have simply plugged with clay on windy
>days.
> If it burns too fast, you won't get much black, but it can be refired.
>For
>color using copper carb, etc., and kosher salt for texture, pit firing is
>more effective, but that is a different firing technique.
>Joyce A
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Lamar, Luke on thu 10 aug 00
I just joined ClayArt. This message is in response to Raku Boy's sawdust
firing question posted in March.
I have recently been experimenting with sawdust firing in a trashcan simiar
in size to yours. I found that if there or too many holes or they are too
large in size, the fire burns hotter and my pieces (burnished, white
stoneware) are mostly white. I have reduced the number of holes so the
firing lasts about 7 hours (very little, or no wind). I get nice dark
blacks, medium to light browns, and taupe.
I too, am very interested in the colors different types of wood will
produce. Can anyone comment on their experiences with different types of
wood and different sawdust granularity?
My Experiences:
coarse, red oak (chainsaw sawdust) - deep brown to black
very fine (almost powdered) popular - intense, dark black
fine cherry - light taupe to a medium tan/brown
Luke
Marcia Selsor on thu 10 aug 00
I use a 55 gallon barrel with four one inch holes in each of the three
layers of the barrel. I keep them plugged up unless the fire needs some
air. I can give it a boost to get it hotter in whatever spot needs it.
Marcia in Montana
where the smoke is not from potters.
"Lamar, Luke" wrote:
>
> I just joined ClayArt. This message is in response to Raku Boy's sawdust
> firing question posted in March.
>
> I have recently been experimenting with sawdust firing in a trashcan simiar
> in size to yours. I found that if there or too many holes or they are too
> large in size, the fire burns hotter and my pieces (burnished, white
> stoneware) are mostly white. I have reduced the number of holes so the
> firing lasts about 7 hours (very little, or no wind). I get nice dark
> blacks, medium to light browns, and taupe.
>
> I too, am very interested in the colors different types of wood will
> produce. Can anyone comment on their experiences with different types of
> wood and different sawdust granularity?
>
> My Experiences:
> coarse, red oak (chainsaw sawdust) - deep brown to black
> very fine (almost powdered) popular - intense, dark black
> fine cherry - light taupe to a medium tan/brown
>
> Luke
>
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--
Marcia Selsor
selsor@imt.net
http://www.imt.net/~mjbmls
http://www.imt.net/~mjbmls/spain99.html
http://www.silverhawk.com/ex99/selsor/welcome.html
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