1) Food coloring 
Brown FK, also called Kipper Brown, Chocolate Brown FK, and C.I. Food Brown 1, is a brown mixture of six synthetic azo dyes, with addition of sodium chloride, and/or sodium sulfate. It is very soluble in water. Its CAS number is {CASREF|CAS=8062-14-4}. When used as a food dye, its E number is E154. It was used in smoked and cured mackerels and oth...