Brown FK is a mixture of synthetic, brown, azo dyes, sodium chloride or sodium sulphate, and water.
In rats and mice, exposure to Brown FK has caused damage to muscle fibers in the heart, degeneration of the kidney, increased fat mass in the liver, and increased internal organ weight. No carcinogenic effects have been seen. There is no data or reported cases of sensitivity, intolerance, or allergy to Brown FK.
Brown FK is banned from use in Australia, and is permitted in the EU only for colouring of smoked fish, particularly kippers and mackerel.
Smoked fish, smoked mackerel, kippers
E154, Kipper Brown, Chocolate Brown FK, C.I. Food Brown 1