cockle shell waddings result

30 11 2008

We used cockle shells as waddings for our pieces. The shell is calcium carbonate and may be with residual salt from the sea water. When the shells are fired at a low bisque temperature, they will become soft and powdery and lose their visible shape. When they are used as waddings at high temperature like our case in the dragon kiln, they may leave delightful marks on the surface from the fluxing of the residual salt which makes a glaze where the shells get in touch with the clay body. However, the shells we used are too small to have any big fan-shaped markings on the clay bodies. The shells also become powdery after firing except for some reasons, three of them are stuck to the glaze on Siew Kuan’s piece.

31Nov2008_shell wadding_SK 31Nov2008_shell waddings

My three bowls are made of Neo Tiew white clay not Jalan Bahar white clay which is more sandy gold rather than Jalan Bahar dull grey after firing. The markings left by the cockle shells are very visible but nothing stuck to the bowls like Siew Kuan’s. The end result is very ‘mild’ as there is no significant evidence on ash and salt glaze effect on the bowls.

31 Nov 2008_shell wadding bowls

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