I heard they use bones while making bone china crockery
Dear Sir,
The products are made of using organic raw materials and contains no traces of animal residue, please refer to the document for more information - d1u44n5pfh2d1m.cloudfront.net/downloads/03-Le%20Ballet-Updated.pdf
It has to contain bone ash to be considered bone China, otherwise it does not qualify. It usually contains 30-50% bone ash.
Thank you.