clennell on thu 6 sep 01
Sour Cherry Pottery
> ron, would you please give us all a bit
> of your wisdom on firing temmoku.
>
> ian and i have been talking about it, and
> with my new firing system ala hank, long
> 1900 soak, i imagine my temmoku will
> crystallize.
>
> i am thinking that a well reduced firing to cone 10,
> and a quick cool, then not soak.
> bright black and rust.
> hmm.
> what do you think.
> mel
Dear mayor: Dad isn't awake yet, so I'll throw in my two cents- based on
observation not science.
the development of cystals on the surface of the glaze can cause matness.
Slow cooling naturally favours a mat glaze.
If we took your Rhodes 32 and clammed the kiln after firing it would be a
satin mat. If we crashed the kiln to 1900 it would be more of a shiny
surface. We used to do this with an oatmeal glaze- a "clam" firing for the
matt customers and and a crash for the shiny lovers.
I like to think that crashing (leaving peeps and damper open) at end of the
firing "freezes" the glaze in that glassy state. It is frozen so quickly
that cystals don't have time to form.
If we clam an ash glaze you can really see the cystals. glaze looks awful.
Raccoon poop. Crash the same glaze and voila beautiful, ash celedon.
Ithink iron glazes ( like temmies) favour crashing. No cystals, just good
reflectance, brightness and a good hard shiny surface.
A warning to the silicon carbide shelf users. they don't like to be
crashed. that is why I have a preference for the high alumina shelves.
Perhaps Dad is out of his choo-choo train jammmies by now and can answer
your temmie request. Me thinks the kiln shelf thing has a similiar answer-
crystal growth. this is science and I only can offer my observations.
Hope you haven't thrown out your mother in law blue, cause if you are now
going down the gravel road of temmie you had better have a cash flow glaze.
all the best of firings.
Cheers,
tony
Shirley Tschannen on thu 6 sep 01
Hi Tony, being really new to this...could you elaborate on "crash" and "clam".
Here's what I think you are saying; to "crash" is turn off the kiln with peeps
out and cool as fast as possible. then to "clam" is to soak at the top?????
THanks for all you knowledge and good humor!
Shirley Tschannen
clennell wrote:
> Sour Cherry Pottery
>
> > ron, would you please give us all a bit
> > of your wisdom on firing temmoku.
> >
> > ian and i have been talking about it, and
> > with my new firing system ala hank, long
> > 1900 soak, i imagine my temmoku will
> > crystallize.
> >
> > i am thinking that a well reduced firing to cone 10,
> > and a quick cool, then not soak.
> > bright black and rust.
> > hmm.
> > what do you think.
> > mel
>
> Dear mayor: Dad isn't awake yet, so I'll throw in my two cents- based on
> observation not science.
> the development of cystals on the surface of the glaze can cause matness.
> Slow cooling naturally favours a mat glaze.
> If we took your Rhodes 32 and clammed the kiln after firing it would be a
> satin mat. If we crashed the kiln to 1900 it would be more of a shiny
> surface. We used to do this with an oatmeal glaze- a "clam" firing for the
> matt customers and and a crash for the shiny lovers.
> I like to think that crashing (leaving peeps and damper open) at end of the
> firing "freezes" the glaze in that glassy state. It is frozen so quickly
> that cystals don't have time to form.
> If we clam an ash glaze you can really see the cystals. glaze looks awful.
> Raccoon poop. Crash the same glaze and voila beautiful, ash celedon.
> Ithink iron glazes ( like temmies) favour crashing. No cystals, just good
> reflectance, brightness and a good hard shiny surface.
> A warning to the silicon carbide shelf users. they don't like to be
> crashed. that is why I have a preference for the high alumina shelves.
> Perhaps Dad is out of his choo-choo train jammmies by now and can answer
> your temmie request. Me thinks the kiln shelf thing has a similiar answer-
> crystal growth. this is science and I only can offer my observations.
> Hope you haven't thrown out your mother in law blue, cause if you are now
> going down the gravel road of temmie you had better have a cash flow glaze.
> all the best of firings.
> Cheers,
> tony
>
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clennell on thu 6 sep 01
Sour Cherry Pottery
> Hi Tony, being really new to this...could you elaborate on "crash" and
> "clam".
> Here's what I think you are saying; to "crash" is turn off the kiln with
> peeps
> out and cool as fast as possible. then to "clam" is to soak at the top?????
> THanks for all you knowledge and good humor!
> Shirley Tschannen
Sorry Shirley: After reaching temperature- Clam is to cover up the burner
ports, close the damper, go around and try to stick fibre in holes and make
the kiln as air tight as possible. Crashing for me is to shut the kiln off,
pull the two peeps, open the damper wide open and let it crash to about
1900. Usually takes an hour. I saw a potter in Britain take most of the
door down to crash cool-I don't recommend this.
Good pots to you!
Tony
P>S Bet you can tell I'm the crash cooling type personality!
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