Electric Mid&Hi Fired Ceramics
Potters & Sculptors - Making Rock from Mud
Check this out- same glaze, different cooling cycle- Red from MC6 Waterfall Brown
I have been trying to get iron red out of my kiln ever since I replaced it. Kept trying to slow cool from 1800 F down to 1500 F- This is proving to me that the "sweet spot" is lower in temp than I've been going. In an attempt to save a load of tableware through its slow cool cycle after my sitter tripped and stopped the kiln, I ramped it back up from 1227 up to 1800 and then slow cooled, 150 per hour to 1500. Somewhere in the process I turned all of my brown dishes red/orange. After putting them back in the kiln and refiring to cone 6, they darkened up to a much nicer red, with dark flecks and fun stuff on the surface. They don't match the rest of the set, but they are kind of cool.
The saga continues.
8/18 update(and note to self): 1250 degrees is not hot enough. I did a low bisque of pots (^018 with a 15 min hold) with terra sig on them for a barrel firing and threw in some wfl brown test pots to see if they'd turn. No dice. Next test will be closer to 1500, I guess.
Latest- magic temp for me is 1650 F with an hour hold- I then slow cool, 150 per hr, to 1400.
Comment
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Comment by Tracy Shea on October 29, 2012 at 8:04pm
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That is right, Brent. It works that way, too.
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I think if you put one of your waterfall brown pieces in with a bisque fire you will get the same result. the secret is getting enough time at the temperature range where the red iron crystal grow, which is supposed to be in the 1730 degree range.
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nothing magical...450 degrees per hour up to 2000F, 200 up to 2174F, 250 down to 1650, hold for 1 hour, off.
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Hi Tracy - The pictures are terrific. You mentioned that the magic temperature was 1650 for a 1 hour hold on the way down. I just wanted to verify the rest of the firing program. I have recently been doing cone 10 reduction firing, but want to start doing more cone 6 firings. The information here is really wonderful. Thx in advance.
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I started with an old, 10 cu. ft Skutt kiln. Once ^6 witness cone started going over, I turned it from high to medium for 2 hours, then off. It worked. I got an analog pyrometer to track my results. Once I got my computer controlled kiln, I lost my red. I thought it was the cool, and not a temp hold, that did it. So, I never kept track of the lower temp hold and had to start from scratch.
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yes, ^6, oxidation- sorry, should have indicated that.
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FOUND IT!! the magic temp in my kiln is 1650 for 1 hour.
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It's Standard 211 "hazelnut brown" clay- sorry for the delayed answer, I had not seen your comment until now :)
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Hi -what is the claybody that you are using? Thx, MJ
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Haven't tried ramping it up, will have to give it a try. I've tried various cooling schedules getting nice browns but never coming close to red.
Thanks for the insight.
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