Layers of sawdust, branches, paper, kindling, dried plants, seaweed, coffee grounds, banana peels etc., along with sprinkles of salt and colourants are placed in a stacked brick campfire pit.
My once fired pottery pieces with no glaze on them, are placed amongst these layers.
The top layer of kindling and some firewood is set aflame and will burn hot with flames for a while.
Then a metal lid is placed on top and the contents smoulder for a few hours.
Once cooled the pots are pulled from the ashes and washed off.
The results from the firing are mottled grey to black surfaces with flashes of red, pink, purple, yellow, orange, and turquoise on the surfaces of the pots.
A very unpredictable firing method with some cracking to the pots (as they are in the fire) but lots of anticipation and fun.