This dish ranges in colour from mid tan to dark brown black, has a fine rim and constant 4mm thickness to the foot, fantastic medullary ray visibility, and a gentle warp adding further individuality to the piece. Bog Oak is formed when an Oak tree dies, falls, and is submerged in iron rich water - fenland or peat bogs. The natural ebonisation process occurs when water-soluble tannins in the oak react with iron ions (Fe²⁺ / Fe³⁺) in acidic, anaerobic bog water over hundreds or thousands of years to form stable, dark iron-tannate complexes - the fabulous deep brown/near black colour. The oxygen-free nature of the bog water prevents rotting and decay of the timber. Finished in food safe mineral oil.