rdfs:comment
| - CLAYS: Ball Clay. Blue and black. Very plastic clays. Used with non-plastic materials, such as flint, stone, felspar, or whiting, to form fine earthenwares. Cane and Red Clays. Clays coloured by the presence of ferric oxide, and used extensively for bricks, terra-cotta tiles, and common pottery. Pipe Clay. A very white, smooth clay. Less plastic than ball clays. Much used for making slips, en- gobes, and enamels. Saggar Clays or Fire Clays. Coarse refractory clays strengthened by the addition of grog, used for saggars, fire tiles, and bricks.
|
abstract
| - CLAYS: Ball Clay. Blue and black. Very plastic clays. Used with non-plastic materials, such as flint, stone, felspar, or whiting, to form fine earthenwares. Cane and Red Clays. Clays coloured by the presence of ferric oxide, and used extensively for bricks, terra-cotta tiles, and common pottery. China Clay. A yellowish-white, non- vitreous clay, prod- uct of the decomposition of granitic or felspathic rocks. Cornish China clay is exceptionally white, pure, and plastic. It is widely used with China, or Corn- wall stone and calcined bones, to make bone porcelain. Felspar is added to render it vitreous. Mixed with ball clays, pipe clays, flint, and stone, it makes the various classes of earthen and stone wares. Pipe Clay. A very white, smooth clay. Less plastic than ball clays. Much used for making slips, en- gobes, and enamels. Saggar Clays or Fire Clays. Coarse refractory clays strengthened by the addition of grog, used for saggars, fire tiles, and bricks.
|