Ray Carlton on mon 12 oct 98
unfortunately my isp has lost a whole days email and any replies to my post
with it..so here it is again and any kind souls who may have replied could
they PLEEEAAASE repost it...thanks heaps
hello all...here is one for the glaze experts..
since changing from my 20 year old gas fired d/draft fibre kiln to a new
IFB d/draft I have noticed that the development of the copper reds have
been nowhere near as strong. I have tried various changes in the pattern
and strength of the reduction but nothing seems to increase the depth of
the reds...I am wondering if there is any evidence to suggest that the
slower cooling rate of the IFB kilm 1300-900 in 8 hours [fibre kiln
1300-400 in 8 hours] is allowing the copper to volatise out of the
glaze..Perhaps a lower firng temperature may help..I would be most
interested to hear any comments that anyone may have in this regard
thanks in advance
cheers Ray Carlton
McMahons Creek Victoria Australia
Craig Martell on tue 13 oct 98
Ray:
One thing that I've noticed about copper reds is that they tend to lose
their brilliance and depth if held at high temp for a great length of time.
The higher the temp, and the longer the time spent lingering there, the
greater the chance that one will lose the red.
I fire in a k-26 IFB kiln and I usually go from cone 8 softening to flat
cone 10 in about 2 to 2 1/2 hours. I don't fast cool, I just close the
damper and let the kiln cool as it will. The reds usually come out fine.
June Perry's advice to crash cool to 1800F is good advice though. I don't
do that because my other glazes need to develop crystals and I just don't
baby the reds.
Fiber kilns usually go up and down in temp faster than brick kilns so I'm
wondering why your reds are taking the high road out of town. Are you going
slow at high temp? Maybe stonger reduction at low temp will help?
regards, Craig Martell-Oregon
Christopher J. Anton on thu 15 oct 98
-
>since changing from my 20 year old gas fired d/draft fibre kiln to a new
I>FB d/draft I have noticed that the development of the copper reds have
>been nowhere near as strong. I have tried various changes in the pattern
>and strength of the reduction but nothing seems to increase the depth of
>the reds...
Does this kiln reach cone faster than the old one? Copper reds seem to
develop best with more time in the 1600F to 1900F range.
- Chris
I am a figment of my own imagination,
and one of these days I'll cease imagining myself!
antons@bellsouth.net
Ray Carlton on sun 18 oct 98
good point chris and before i fire this mother again I am going to compare
schedules and see where the differences lie
At 09:24 15/10/98 EDT, you wrote:
>----------------------------Original message----------------------------
>
>-
>
>>since changing from my 20 year old gas fired d/draft fibre kiln to a new
>I>FB d/draft I have noticed that the development of the copper reds have
>>been nowhere near as strong. I have tried various changes in the pattern
>>and strength of the reduction but nothing seems to increase the depth of
>>the reds...
>
>Does this kiln reach cone faster than the old one? Copper reds seem to
>develop best with more time in the 1600F to 1900F range.
>
> - Chris
>
>I am a figment of my own imagination,
>and one of these days I'll cease imagining myself!
>
>antons@bellsouth.net
>
cheers Ray Carlton
McMahons Creek Victoria Australia
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