[Clayart] Crash cooling the soda kiln to keep orange peel effect

[Robert Harris]

I saw a firing at Anderson Ranch on the penultimate day of a workshop. They
quite literally opened the whole entire door of one of their big kilns at
Cone 10. It was quite amazing (and I have the photos to prove it!). Now
that's crash cooling! As I recall they took it down to 1100C (2000F - but
they use C up there) over the course of about 15-20 minutes by pulling the
door open then shutting it. The kiln was cool by the next morning, pots
none the worse off.

On Thu, May 10, 2018 at 4:57 PM, Snail Scott <claywork at flying-snail.com>
wrote:

>
>
>
> > On May 10, 2018, at 8:44 AM, Helen Stone <helenestonepeony at gmail.com>
> wrote:
> > ...
> > crash cooling to maintain the effect, does this specifically mean, I just
> > turn off the burners, but leave some areas open for a big (how long is a
> > bit), like for e.g. I could leave the burner ports open and not plug them
> > up for awhile, I could open the soda ports and cone observations ports,
> > this would be really crashing, not sure if I should do that!...
>
>
> It appears to me that when crash-cooling to ‘set’ a glaze, you just need
> to get it below the melt threshold.  In my experience (fairly limited, as I
> don’t do it much) crash-cooling won’t really ‘shock’ the clay until it gets
> cooler than that, as everything is still a bit soft and flexible until
> then, and there is enough thermal mass in the average fuel kiln to keep
> things a bit warm anyway. I wouldn’t worry about overdoing the cooling rate
> until you reach the lower ranges of red heat.
>
> Snail Scott
> claywork at flying-snail.com
> www.snailscott.com
>
>
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