INS No. 131
CAS No. 3536-49-0
CI Food Blue 5
Patent Blue 5
CI No. 42051
Patent blue V is a triarylmethane dye that occurs as a blue powder or granules. It is principally the calcium or sodium salt of 2-[4-[alpha-(4-diethyl-aminophenyl)-5-hydroxy-2,4-disulfonatophenylmethylidene]-2,5-cyclohexadien-1-ylidene] diethylammonium hydroxide inner salt, and subsidiary coloring matters. It may be converted to the corresponding aluminum lake.
Typical applications include beverages, confectionery, bakery, dairy fats and oils, meat, seafood, snacks, dry mixes and seasonings, fruit preparation, and convenient foods.
Toxicological evaluation of some food colours, enzymes, flavour enhancers, thickening agents, and certain food additives (18th report of the Joint Expert Committee on Food Additives), WHO Food Additives Series, No. 6, 1975. Available online
EFSA Panel on Food Additives and Nutrient Sources added to Food (ANS); Scientific Opinion on the reevaluation of Patent Blue V (E 131) as a food additive. EFSA Journal 2013;11(3):2818. [35 pp.]. Available online