A four piece mould of the tea pot being made. First, mustard oil and chapda is put on the body to make the body non absorbent and strong. Then soap water is put so that the mould does not stick to the model and releases easily. Bone china clay is used to block the other half or any other area of the body where plaster is not required.
Slip casting of the teapot is done using bone china slip. Slip is poured into the mould using a seive to avoid any lumps or impurities in the slip. After 10 to 15 minutes the mould is emptied. The slip forms a surface on the mould which is then opened after 30-40 minutes depending upon the delicacy of the object and the thickness of the slip.
Oil is dabbed onto the green ware to foresee cracks in the kiln. Aluminium powder is poured on the the rim so that the refractory setter doesn’t stick to the ware. The bisque firing is done at 1250 o C , the glaze firing at 1050 o C and the decal/ tranfer firing at 700- 800 degree celsius( if required). Setters are kept on the mouth of the ware so that the ware doesn’t deform because bone china has a tendency of sagging and deforming during the firing process.
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