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dawilsoniv

Spots On My Bisque

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I am getting spots on my bisque that are faint but noticeable.  The spots look like something did not burn off completely or its iron traces and they are basically the color of rust or reddish brown.  I am currently firing at cone 6 in an electric kiln.  What am I doing wrong and can it be corrected?  Thanks.

post-59351-0-52438000-1387047403_thumb.jpg

post-59351-0-52438000-1387047403_thumb.jpg

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The slip I make is basically one part ball clay kt14 to two parts talc, soda ash and sodium silicate.  I had considered that some stuff was not burning off completely and that was my first thought when I saw the marks.  Can the bisque I fired at 06 be fired again at a hotter fire?

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I recently did a bisque fire to 04 and found white areas in the bottom of my bowls. I may have stacked other ware inside the bowls, they were all made of the same type of clay. Clay supplier said that this happens sometimes, but that it didn't usually affect the final glazed product. I still wonder why it happens though. It happens only on the bottom...inside and out. This clay should bisque a pinkish to light terra cotta color. I don't understand the white part. Any thoughts?

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