Brown FK

Brown FK (also known as Chocolate Brown FK) is a synthetic food coloring. It is a diazo dye consisting of disodium 4,4'-diazobis(5-oxo-1-(4-sulfophenyl)-pyrazoline-3-carboxylate).

Brown FK is used as a food dye in a limited number of countries, including the United Kingdom. It is typically used to create a brown color in processed foods such as kippers, certain cakes, and chocolate flavored products.

Regulation regarding Brown FK varies. In some regions, its use is restricted or prohibited due to concerns about potential health effects. Concerns raised regarding diazo dyes, including Brown FK, generally relate to potential carcinogenicity. However, evaluations by regulatory bodies have yielded varied conclusions over time.

Consumers who are concerned about artificial food colorings may wish to check ingredient lists carefully to avoid products containing Brown FK, particularly when purchasing processed foods.