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Light Blotchy Looking Surface

bonsai pot;

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#1 mrcasey

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Posted 18 November 2013 - 08:20 PM

Just got some bonsai pots back from the glaze firing.  The picture of the 614

on the Laguna website has a much darker color than what I've gotten.  As you can see from the pictures, the pots are a light orange with lots of weird blotches.      

            

The pottery overseer does all of the firings.  When I spoke to her about my disappointment, she

mentioned that the kiln might not have quite gotten up to correct temperature.  Can anyone tell

from the pictures what might have gone wrong?  

 

thanks,

Casey                

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#2 oldlady

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    single firing an electric kiln to cone 6

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Posted 18 November 2013 - 11:41 PM

how did you apply the glaze? what temp and kind of clay?  looks like uneven brushwork at a glance.


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#3 mrcasey

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Posted 19 November 2013 - 01:57 AM

This pot was not glazed and supposed to be fired to cone 6.  I wanted to just have the natural

color of the vitrified clay.  It is supposed to be a darker brown.  The clay is Laguna WC 614.                    



#4 PSC

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Posted 19 November 2013 - 03:30 AM

Was it created in a studio that uses a lot of lighter colored clays? I find handling greenware while loading a kiln of different colored clays sometimes transfers lighter clay dust to darker clays that show up after firing.

#5 neilestrick

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Posted 19 November 2013 - 09:37 AM

Looks to me like it was only bisque fired. Did the person firing it realize you wanted it fired to cone 6, or did she just bisque fire it, assuming you were going to then glaze it? Is it still porous? If so, it was only bisqued.


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#6 mrcasey

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Posted 19 November 2013 - 01:21 PM

We do use a lot of white clay for throwing.  My pots had already been bisque fired and were slated for the 

"glaze" firing.  I'm told that another person's pots came out looking a bit strange as well.  When I tap the pots they do have a

bit of the high pitched ring.  Don't know if the pitch is high enough to indicate complete vitrification ...  



#7 PSC

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Posted 19 November 2013 - 01:44 PM

Was laguna's photo sample fired in oxidation or reduction? Makes a big difference in clay color.

#8 timbo_heff

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Posted 20 November 2013 - 01:05 PM

I agree w/ Neil: looks more like 06 than 6 .underfired






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