Red squared store jar
Squared soda-fired lidded jar with tenmoku glaze, and yellow "blush" to one face.
Tenmoku is a high iron glaze which usually fires black under reduction. But in soda vapour, the glaze has fired a deep red, with a patch of yellow where the flame has flashed a higher concentration of soda to one face. A very pleasing effect.
Vapour fired to 1300 C in a gas kiln.
Soda, or vapour, firing is a firing process where sodium in some form - sodium carbonate or bicarbonate, is introduced into the kiln as a solution when the temperature is at 1250˚C.
The soda immediately volatises, and combines with the silica in the clay to form a lustrous glaze with often spectacular surfaces where the flame has licked around the pot, taking the soda with it.
The randomness of this process gives each pot its own unique character.
Prior to firing, the pots are dipped into different clay slips (liquid clay) to give different colours and effects.