Test bar made from 20% bentonite and 80% calcium carbonate

It fumes a glassy glaze onto nearby test bars at cone 10R. This fumed glaze layer on the other bars is thick enough to craze and is transparent and glossy. Any ideas why this happens? Please let me know.

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Materials	Calcium Carbonate In ceramics, calcium carbonate is primarily a source of CaO in raw stoneware and porcelain glazes.
Materials	Bentonite Bentonite can make a clay body instantly plastic, only 2-3% can have a big effect. It also suspends slurries so they don't settle out and slows down drying.

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