Obvara Firing is an Eastern European technique. The bisque fired pots are fired in a Raku kiln. As they are removed they are dipped in mixture of flour, yeast, sugar and water and then plunged in to water to stop the changes. The longer the pot stays in the flour mixture, the darker the effect. It is a rapid process, so literally seconds in the mixture makes the changes.
The pots work well if they are burnished at the leatherhard stage. They also work well with texture on the outside as the colours of the technique really highlight the marks.
The recipe ( if you can call it that) is: 2.2 lb of flour/ 1-2 packets of yeast/ 1tbsp sugar/ 2.6 gallons of water. Mix together 2-3 days before use to allow to ferment.
Warning: it is quite smelly and if you are transporting the mixture put the pot in a plastic bag to protect the car! If you look up Baltic Raku or Obvara Raku on the internet you will find videos and other examples of the firing technique.