The color is developing despite the fact that very little iron is available from the body. I have glazed the inside of this mug with a durable liner glaze to make it functional. The porcelain contains more than 30% silica but the Shino is still crazing on it.
Traditional Japanese high feldspar glazes having cream to orange color flashing or blushing. Potters today seek to emulate the Shino appearance using a wide range of recipes.
How to Liner-Glaze a Mug
A step-by-step process to put a liner glaze in a mug that meets in a perfect line with the outside glaze at the rim.