Digitalfire Ceramic Glossary

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Bone China


True bone china is a special type of porcelain that is more translucent and stronger. Instead of feldspar, bone ash is used as the flux. The process requires more careful attention than normal porcelain. The vitrification range is narrow, kilns need to be fired carefully. Ware warps so badly that it must be fired without glaze and supported in setters during the firing (it is then glazed and fired again at a low temperature). Forming methods have to be adapted to the very low plasticity of the bodies. Glazes have to be adapted because the ware has zero porosity. The whole process is quite foreign to what workers in an average pottery would be accustomed to.

Out Bound Links

In Bound Links

  • (Materials) Bone Ash - Ca5(OH)(PO4)3

    Calcium Phosphate

  • (Glossary) Vitrification

    'Vitrification' is a process. As clay is fired hot...

  • (Glossary) Tranlucency

    Translucent glazes are neither opaque or transpare...

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