Patent Blue V (Patent Blue V, Food Blue 5, Sulphan Blue, E131) is a synthetic dye of blue or purple color. It is known as coal tar or azo dye.
It is banned in some countries, including the European Union, the United States and Australia.
It can be used in minced meat, sausages and other meat products. It is also used as a paint in medical diagnostic procedures.
Potential effects: asthma, gastrointestinal disorders, anaphylaxis, urticaria, hyperactivity, allergic reactions. Aspirin-sensitive people are best avoided.