Art 399: CUPS 41-50

I used a new clay body for the next round of cups:  Porcelaneous Stoneware.  This clay still matures at cone 10.  The recipe calls for equal parts of Tennessee Ball Clay, Tile #6, Silica (Flint), and Custer Feldspar, plus a bit of bentonite.  This type of stoneware has a white body and no grog, so it resembles porcelain.  (So why not just use porcelain?  Real porcelain contains Grolegg, which is quite expensive.  Many clay recipes have been developed to mimic the effects of porcelain without grolegg).  

The difficult properties of both porcelain and porcelaneous stoneware is that it has alot of memory, and that it doesn't stand well (because it has no grog.  Grog is a very fine textured aggregate or sand).  The remainder of the cups this semester were a bit thicker due to the difficulty of working with these type of clays.  Also, these clays shrink alot.  My cups each seem a bit smaller that what feels normal.  

Please don't judge too harshly.

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Scraffitto, black slip.  Amber Celadon glaze.  Red Gas Kiln 3-26-10. 

Scraffitto is the process of carving through a contrasting colored slip to reveal the claybody below.  I was really excited about these pieces, but the image was lost once it was glazed.

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Scraffitto, black slip.  Amber Celadon glaze.  Red Gas Kiln 3-26-10.

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Scraffitto, green slip.  Amber Celadon glaze.  Red Gas Kiln 3-26-10.

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Scraffitto, green slip.  Pete's Clear glaze.  Red Gas Kiln 3-26-10.  (This clear glaze was much more successful atnpreserving the scraffitto design).

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Rich Blue glaze.  Soda fired 3-25-10.  Bailey, gas fired, reduction 3-26-10.

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Black Tea Dust glaze.  Soda Fired 3-25-10.

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Resist Etching.  Basic Green Celadon glaze.  Bailey Kiln, gas-fired, reduction 4-14-10.

 

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Resist Etching.  Basic Green Celadon glaze.  Bailey Kiln, gas-fired, reduction 4-14-10.

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Sana's Green.  Soda fired 3-25-10.

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Chun Clear and Basic Green Celadon glaze.  Bailey Kiln, gas-fired, reduction 4-14-10.

This pink was not intended... that is how the glaze reacts in a reduction firing.  The same glaze fired in an oxcidation kiln is a clear blue/green color.