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Both of these are a kaolin:nepheline syenite blend (mixed 70:30, that produces a zero-porosity body around cone 9 for an American kaolin). Both of these have about 2.5% porosity at cone 6, they respond similarly to the glaze and the fired color is very similar. The McNamee clay has a 1% higher fired shrinkage (10.5% vs. 9.5%) and it requires a little more water to get the same plasticity.
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McNamee Kaolin
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