Ann Zerger, Associate AIA and Chip Parker, AIA on tue 23 jun 98
I have a forced air updraft salt kiln, that has served me well both with
a reducation or oxidation firing. Lately I get a more muddy look when I
do a reduction fire, and am getting what I think is carbon trapping.
Any suggestions on how to do a nice light to medium reduction without
the muddy , carbon trapping. Thanks. Send reply to:
Ann
c1pwd@midusa.net
William Moody on wed 24 jun 98
Ann Zerger, Associate AIA and Chip Parker, AIA wrote:
> ----------------------------Original message----------------------------
> I have a forced air updraft salt kiln, that has served me well both with
> a reducation or oxidation firing. Lately I get a more muddy look when I
> do a reduction fire, and am getting what I think is carbon trapping.
> Any suggestions on how to do a nice light to medium reduction without
> the muddy , carbon trapping. Thanks. Send reply to:
>
> Ann
> c1pwd@midusa.net
It probably is carbon trapping. In my limited experience I find it useful
to "clear" the kiln atmosphere for the last 15 minutes or so of the firing.
I read about this some where that it helps make celadons less muddy, and it
seems to work for me.
David Cuzick on thu 25 jun 98
I have had the same experience of carbon graying the glass build up when
"salt' firing. Try doing the following to reduce the problem. Do your regular
body reduction at about cone 08 + or - two cones, then oxidize the kiln at
about cone 3 (1150C) for about 30 mins. this is the point the soda build up in
the kiln will begin to volotize and seal the pots, then go to a mild reduction
or netural atm. until you get to the point you introduce the sodium (in what
ever form that may be). Be careful not to introduce the soda too fast as this
will cause a great deal of reduction too (as one of the by products of soda
firing is CO2) and possible carbon trapping. I have found that it is better to
add the soda over a period of an hour or more and not too much at any one
time.
I hope that this helps.
David Cuzick
San Diego,CA
claycuzian@aol.com
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