bone ash is made by burning the bones of all animals
As far as I know, the type of animal doesn't matter, I would guess that the bones used are byproducts from meat packing plants or slaughterhouses, and would therefore be bones from whatever type of animal is most frequently consumed in the area that the porcelain is being made.
Bone china is made out of clay, not bones. Actually, bone china is made out of clay AND bone ash, which is the white ash produced from the burning of bones in open air. I would assume any type of bone could be used.
The 'bone' in bone china indicates that the china clay has been mixed with bone ash.
50%Bone ash 25% each of china clay and china stone.
"Insulator" as in electrically resistant material ? No. Bone ash was once tested as part of an experiment to increase the magnitude of a light bulb's output : it passed the test , but the fumes were such that it was not recommended to continue using it. Bone China is made of Bone Ash : Dry bone is piezoelectric.
because bone ash is considered as unauspecious
Bone china is made of 50% bone ash, & 25% each of china clay and china stone. It is combined with water to make a slurry, which is then fashioned into cups, saucers, plates and so on. The pieces must be fired in a kiln at high degrees of heat (1100c to 1250c) for the china to become hard and strong. It is the bone (usually animal bone, cleaned of all meat and glue) that gives the china its transparent whiteness. The ingredients of bone china are china clay, china stone, silica, alumina, alkalies, lime and bone ash. It is fired at high of 2,300 to 2,500 degrees Fahrenheit. In the best grades of English bone china, 50% or more of the body consists of refined bone ash prepared from specially selected animal bones which are reduced to a fine powder by heat. The bone is mixed with the finest china clays and highest quality Cornish stone. Specially skilled workers are needed in the manufacture of bone china and the best and most highly skilled in the world are found in the pottery district of England.
Bone china dishes qualify. They are made from china clay and bone ash.
Bone China housewares are made up of 3 main ingredients. They housewares are made up of fifty percent bone ash, twenty-five percent stone, and twenty-five percent clay. The stone and clay amounts can differ depending on where it was made.
Because animal bone is porous, it is inappropriate for use as dinnerware, because it cannot be easily cleaned.
Whale, human, animal.
they certainly are, and crushed bone!