High Quality Content by WIKIPEDIA articles! Patent Blue V, also called Food Blue 5 or Sulphan Blue, is a dark bluish synthetic dye used as a food coloring. As a food additive, it has E number E131. It is a sodium or calcium salt of [4-( -(4-diethylaminophenyl)-5-hydroxy- 2,4-disulfophenylmethylidene)-2,5-cyclohexadien-1-ylidene] diethylammonium hydroxide inner salt. It has the appearance of a violet powder.Its CAS number is [3536-49-0] and its SMILES structure is CCN(CC)c1ccc(cc1)C(=C2C=CC(C=C2)=[N(CC)CC)c3cc(O)c(OS([O-])=O)cc3OS([O-])=O. It is not widely used, but can be found in Scotch eggs and certain jelly sweets. Patent Blue V is banned as a food dye in Australia, USA, and Norway.

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