Jack’s pots are not glazed in a traditional sense. A smooth thin layer of liquid porcelain slip containing copper carbonate, as a single colouring material, is applied to the thrown and altered forms before firng. The copper mineral produces the characteristic blue and turquoise colours particularly associated with Jack's work.
The unique surfaces and extraordinary range of colour from lemon yellow to deep russet and smokey grey are produced through the chemical reaction in the white-hot heat of the kiln’s atmosphere.
“The palette of colours Jack plays with from cerulean blues and blushes of warm russets and oranges are brought to life in the fire.”
