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akin4843

Firing Too Dark/uneven

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akin4843    2

I am using a Skutt Manual Kiln (Lo/Med/High Knobs) and this is my second glaze firing on the kiln. The first batch came out where I'm pretty sure I over fired because they all came out brown. Well this time I stopped the kiln (sitter is broken) earlier to see what happens and I noticed that the color of some pots are "ok" while others are still too dark. You can see below and example. In the pic those two bowls are the same glaze color (croc blue/coyote) but the one on the right is just way to dark. I forgot to note what part of the kiln the pots were stationed so I can't rule out uneven elements....although the elements are new. Also, this was done at cone 6. I was wondering if I fired at cone 5 would I get better results...Not sure what to do here as I have little knowledge of kilns and this old manual kiln was all I can afford at the moment..Any ideas/suggestions? Thanks in advance!

post-13218-0-55332500-1386172090_thumb.jpg

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bciskepottery    925

Looks to be more of a glaze thickness issue . . . the one that looks too dark probably had too thin of a glaze application; the nice blue one had a better thickness. 

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mregecko    18

I agree it's a glaze thickness issue.

 

This appears to be a pretty typical floating blue glaze (or blue rutile, or whatever you want to call it).

 

They pretty much always go on brown where their application is thin.

 

And, in my experience, cone six floating blues are very resilient to changes in temperature up or down a cone. They will still come out blue, just with a different visual texture.

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akin4843    2

Oh thanks guys......I was so worried it was an issue w/ the temp in my kiln. When I mixed my glaze I think I ended up thinning it out too much. Is there a way to thicken it back up again, or should I add more dry powder to the mix?

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Chris Campbell    1,087

One way to get water out of a glaze is to hang a cloth on the rim with one edge just touching the glaze ... The water will wick up the towel without disturbing your glaze. This works well with slips too.

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akin4843    2

One way to get water out of a glaze is to hang a cloth on the rim with one edge just touching the glaze ... The water will wick up the towel without disturbing your glaze. This works well with slips too.

 

Are you referring to the rim of the glaze bucket, or the rim of the glazed pot? Just clarifying....

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Chris Campbell    1,087

 

One way to get water out of a glaze is to hang a cloth on the rim with one edge just touching the glaze ... The water will wick up the towel without disturbing your glaze. This works well with slips too.

 

Are you referring to the rim of the glaze bucket, or the rim of the glazed pot? Just clarifying....

 

The rim of the glaze bucket.

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oldlady    1,323

great reminder, chris.  gotta do that with this year's overspray bucket. thanks! :P

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Bob Coyle    113

Wow Chris... I'll bet this will work to get the last standing water out of a bucket of raw clay I dug up and slacked without pouring off any of the fines. Thanks!

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