<P> The production of bone china is similar to porcelain , except that more care is needed because of its lower plasticity and a narrower vitrification range . The traditional formulation for bone china is about 25 % kaolin , 25 % Cornish stone and 50 % bone ash . The bone ash that is used in bone china is made from cattle bones that have a lower iron content . These bones are crushed before being degelatinised and then calcined at up to 1250 ° C to produce bone ash . The ash is milled to a fine particle size . The kaolin component of the body is needed to give the unfired body plasticity which allows articles to be shaped . This mixture is then fired at around 1200 ° C. The raw materials for bone china are comparatively expensive , and the production is labour - intensive , which is why bone china maintains a luxury status and high pricing . </P>
<P> The production of bone china is similar to porcelain , except that more care is needed because of its lower plasticity and a narrower vitrification range . The traditional formulation for bone china is about 25 % kaolin , 25 % Cornish stone and 50 % bone ash . The bone ash that is used in bone china is made from cattle bones that have a lower iron content . These bones are crushed before being degelatinised and then calcined at up to 1250 ° C to produce bone ash . The ash is milled to a fine particle size . The kaolin component of the body is needed to give the unfired body plasticity which allows articles to be shaped . This mixture is then fired at around 1200 ° C. The raw materials for bone china are comparatively expensive , and the production is labour - intensive , which is why bone china maintains a luxury status and high pricing . </P>
where does the bone ash for bone china come from
where does the bone ash for bone china come from
cattle bones
cattle bones