The term 'floating' could refer to two possibilities in our observation: The blue cobalt colored surface appears to float on a translucent brown glass layer. Like the Butterscotch glaze, the fired effects produced by this recipe are a testament to the variegating effects that 4% rutile imparts to colored non-opacified boron glazes. Its borate content is about middle-of-the-road compared to the range of recipes that we have studied. Like most other popular glossy GB base glazes, this one also uses nepheline syenite, silica and kaolin. In fact, the vase that graces the cover of the book uses this glaze. The author calls it "spectacular and extraordinary". It was popularized by the book The Potter's Complete Book of Clay and Glazes by James Chappell (in the current edition it is on page 210 under the heading "Floating Glazes"). Floating Blue (also called Blue Hare's Fur) is probably the most well known and popular cone 6 pottery glaze.
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