The practice of mixing porcelains of two or more different colors (the porcelains are typically colored using metal oxides or stains). To produce a quality fired product it is important that the clays are the same stiffness and have the same drying and fired shrinkages and the same thermal expansions.
Cone 6 translucent marbled bowl by Tony Hansen
A transparent glazed. It is a made from Plainsman Polar Ice in 2014 (a New Zealand kaolin based porcelain) and fired to cone 6 with G2926B clear glaze. 5% Mason 6306 teal blue stain was added to the clay, then this was wedged only a few times. The piece was thrown, then trimmed on the outside at the leather hard stage and sanded on the inside when dry.
Cone 6 porcelain marbled and thrown
These bowls were made by Tony Hansen using a mixture of white and stained New-Zealand-kaolin-based porcelain (Plainsman Polar Ice) fired at cone 6. The body is not only white, but very translucent.