(often attributive) Lead glazing used for pottery.
1912, Alice Hamilton, Lead Poisoning in Potteries, Tile Works, and Porcelain Enameled Sanitary Ware Factories, Bulletin of the United States Bureau of Labor, Whole Number 104, Industrial Accidents and Hygiene Series, No. 1, page 18,
In the sanitary-ware potteries of Trenton, and in the general-ware potteries of East Liverpool, the glost-kiln men simply place the glazed ware in saggers, and therefore the only exposure to lead comes from getting their hands smeared with the glaze.
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