Here's a couple of porcelain bowls from 2008 about 4 h x 5 w inches each. Sorry about photo quality. The bowls are long gone and these are the only photos I have. These were thrown with a grolleg porcelain developed by Tom Coleman. Both bowls were fired on the bottom shelf in an updraft gas kiln in the same load to Cone 11.
The first has a Jensen red glaze. I never had this glaze break white except on this bowl. The second bowl has a tea dust glaze breaking to a reddish brown color. Breaking is where a glaze changes color or variegates at the edges or over texture of a piece of pottery and is considered desirable trait. These glazes and clay can be obtained from Aardvark Clay in Los Angeles. I hope to get back to throwing one of these days. I keep watching the ads for a used wheel but so far no luck. Maybe some day I'll high fire again too. Here is a great article on reduction firing by Linda Arbuckle. Thanks for reading and for all your comments.