- Patent Blue V
Patent Blue V, also called Food Blue 5 or Sulphan Blue, is a dark bluish synthetic
dyeused as a food coloring. As a food additive, it has E numberE131. It is a sodium or calcium salt of [4-(α-(4-diethylaminophenyl)-5-hydroxy- 2,4-disulfophenyl-methylidene)-2,5-cyclohexadien-1-ylidene] diethylammonium hydroxide inner salt. It has the appearance of a violet powder.
It is not widely used, but can be found in
Scotch eggs. Patent Blue V is banned as a food dyein Australia, USA, and Norway.
In medicine, Patent Blue V is used in
lymphangiographyas a dye to color lymph vessels. [ [http://jnm.snmjournals.org/cgi/content/full/44/4/649 Erratum - 44 (4): 649 - The Journal of Nuclear Medicine ] ] Though there is lot of ambiguity of the name patent blue v and it is different than food blue 5. It is also used in dental disclosing tabletsas a stain to show dental plaqueon teeth.
It may cause allergic reactions, with symptoms ranging from itching and
nettle rashto nausea, hypotension, and in rare cases anaphylactic shock; it is not recommended for children.
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