ISBN: | 978-5-5125-1106-0 |
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 diethylammonium hydroxide inner salt. It has the appearance of a violet powder.